{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T04:42:21Z","timestamp":1768884141891,"version":"3.49.0"},"reference-count":88,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2022,5,4]],"date-time":"2022-05-04T00:00:00Z","timestamp":1651622400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000104","name":"NASA Health and Air Quality Applied Sciences Team (HAQAST)","doi-asserted-by":"publisher","award":["NNX16AQ92G"],"award-info":[{"award-number":["NNX16AQ92G"]}],"id":[{"id":"10.13039\/100000104","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000104","name":"NASA Health and Air Quality Applied Sciences Team (HAQAST)","doi-asserted-by":"publisher","award":["80NSSC21K0427"],"award-info":[{"award-number":["80NSSC21K0427"]}],"id":[{"id":"10.13039\/100000104","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Wisconsin Hilldale Undergraduate\/Faculty Research Fellowship","award":["NNX16AQ92G"],"award-info":[{"award-number":["NNX16AQ92G"]}]},{"name":"Wisconsin Hilldale Undergraduate\/Faculty Research Fellowship","award":["80NSSC21K0427"],"award-info":[{"award-number":["80NSSC21K0427"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>This study evaluates formaldehyde (HCHO) over the U.S. from 2006 to 2015 by comparing ground monitor data from the Air Quality System (AQS) and a satellite retrieval from the Ozone Monitoring Instrument (OMI). Our comparison focuses on the utility of satellite data to inform patterns, trends, and processes of ground-based HCHO across the U.S. We find that cities with higher levels of biogenic volatile organic compound (BVOC) emissions, including primary HCHO, exhibit larger HCHO diurnal amplitudes in surface observations. These differences in hour-to-hour variability in surface HCHO suggests that satellite agreement with ground-based data may depend on the distribution of emission sources. On a seasonal basis, OMI exhibits the highest correlation with AQS in summer and the lowest correlation in winter. The ratios of HCHO in summer versus other seasons show pronounced seasonal variability in OMI, likely due to seasonal changes in the vertical HCHO distribution. The seasonal variability in HCHO from satellite is more pronounced than at the surface, with seasonal variability 20\u2013100% larger in satellite than surface observations. The seasonal variability also has a latitude dependency, with more variability in higher latitude regions. OMI agrees with AQS on the interannual variability in certain periods, whereas AQS and OMI do not show a consistent decadal trend. This is possibly due to a rather large interannual variability in HCHO, which makes the small decadal drift less significant. Temperature also explains part of the interannual variabilities. Small temperature variations in the western U.S. are reflected with more quiescent HCHO interannual variability in that region. The decrease in summertime HCHO in the southeast U.S. could also be partially explained by a small and negative trend in local temperatures.<\/jats:p>","DOI":"10.3390\/rs14092191","type":"journal-article","created":{"date-parts":[[2022,5,4]],"date-time":"2022-05-04T08:21:25Z","timestamp":1651652485000},"page":"2191","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Ambient Formaldehyde over the United States from Ground-Based (AQS) and Satellite (OMI) Observations"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6491-7171","authenticated-orcid":false,"given":"Peidong","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA"},{"name":"Nelson Institute Center for Sustainability and the Global Environment (SAGE), University of Wisconsin-Madison, Madison, WI 53706, USA"}]},{"given":"Tracey","family":"Holloway","sequence":"additional","affiliation":[{"name":"Nelson Institute Center for Sustainability and the Global Environment (SAGE), University of Wisconsin-Madison, Madison, WI 53706, USA"},{"name":"Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6118-964X","authenticated-orcid":false,"given":"Matilyn","family":"Bindl","sequence":"additional","affiliation":[{"name":"Nelson Institute Center for Sustainability and the Global Environment (SAGE), University of Wisconsin-Madison, Madison, WI 53706, USA"}]},{"given":"Monica","family":"Harkey","sequence":"additional","affiliation":[{"name":"Nelson Institute Center for Sustainability and the Global Environment (SAGE), University of Wisconsin-Madison, Madison, WI 53706, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3541-7725","authenticated-orcid":false,"given":"Isabelle","family":"De Smedt","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy (BIRA-IASB), 1180 Brussels, Belgium"}]}],"member":"1968","published-online":{"date-parts":[[2022,5,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"10844","DOI":"10.1029\/JC088iC15p10844","article-title":"Formaldehyde (HCHO) measurements in the nonurban atmosphere","volume":"88","author":"Lowe","year":"1983","journal-title":"J. Geophys. Res."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2597","DOI":"10.5194\/acp-16-2597-2016","article-title":"Formaldehyde production from isoprene oxidation across NOx regimes","volume":"16","author":"Wolfe","year":"2016","journal-title":"Atmos. Chem. Phys."},{"key":"ref_3","first-page":"339","article-title":"Chapter 12 The relation between ozone, NOx and hydrocarbons in urban and polluted rural environments","volume":"1","author":"Sillman","year":"1998","journal-title":"Dev. Environ. Sci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"4180","DOI":"10.1029\/2002JD002153","article-title":"Mapping isoprene emissions over North America using formaldehyde column observations from space","volume":"108","author":"Palmer","year":"2003","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"D24S02","DOI":"10.1029\/2005JD006853","article-title":"Formaldehyde distribution over North America: Implications for satellite retrievals of formaldehyde columns and isoprene emission","volume":"111","author":"Millet","year":"2006","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"ACH-8","DOI":"10.1029\/2001JD000716","article-title":"Product analysis of the OH oxidation of isoprene and 1,3-butadiene in the presence of NO","volume":"107","author":"Sprengnether","year":"2002","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"919","DOI":"10.1016\/0032-0633(72)90177-8","article-title":"Photochemistry of the lower troposphere","volume":"20","author":"Levy","year":"1972","journal-title":"Planet. Space Sci."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2063","DOI":"10.1016\/S1352-2310(99)00460-4","article-title":"Atmospheric chemistry of VOCs and NOx","volume":"34","author":"Atkinson","year":"2000","journal-title":"Atmos. Environ."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1999","DOI":"10.1029\/2003GL017336","article-title":"Seasonal and interannual variability of North American isoprene emissions as determined by formaldehyde column measurements from space","volume":"30","author":"Abbot","year":"2003","journal-title":"Geophys. Res. Lett."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1161","DOI":"10.1029\/1999GL900156","article-title":"Biomass burning as a source of formaldehyde, acetaldehyde, methanol, acetone, acetonitrile, and hydrogen cyanide","volume":"26","author":"Holzinger","year":"1999","journal-title":"Geophys. Res. Lett."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"9897","DOI":"10.1029\/92JD00682","article-title":"A global inventory of volatile organic compound emissions from anthropogenic sources","volume":"97","author":"Piccot","year":"1992","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1023\/A:1006383520819","article-title":"Intercomparison of Formaldehyde Measurements in Clean and Polluted Atmospheres","volume":"37","author":"Brassington","year":"2000","journal-title":"J. Atmos. Chem."},{"key":"ref_13","unstructured":"U.S. Environmental Protection Agency (2017, August 30). Compendium Methods for the Determination of Toxic Organic Compounds in Ambient Air: Compendium Method TO-11A, Available online: https:\/\/www3.epa.gov\/ttnamti1\/files\/ambient\/airtox\/to-11ar.pdf."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1428","DOI":"10.1021\/es00069a018","article-title":"2,4-Dinitrophenylhydrazine-coated silica gel cartridge method for determination of formaldehyde in air: Identification of an ozone interference","volume":"23","author":"Arnts","year":"1989","journal-title":"Environ. Sci. Technol."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"48","DOI":"10.1007\/BF00323325","article-title":"Interferences of nitrogen dioxide in the determination of aldehydes and ketones by sampling on 2,4-dinitrophenylhydrazine-coated solid sorbent","volume":"345","author":"Karst","year":"1993","journal-title":"Fresenius\u2019 J. Anal. Chem."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"2814","DOI":"10.1021\/es00049a022","article-title":"Evaluation of ozone and water vapor interferences in the derivatization of atmospheric aldehydes with dansylhydrazine","volume":"27","author":"Rodier","year":"1993","journal-title":"Environ. Sci. Technol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1007\/s002160051313","article-title":"Disturbance of the determination of aldehydes and ketones: Structural elucidation of degradation products derived from the reaction of 2,4-dinitrophenylhydrazine (DNPH) with ozone","volume":"364","author":"Achatz","year":"1999","journal-title":"Fresenius\u2019 J. Anal. Chem."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1093","DOI":"10.1109\/TGRS.2006.872333","article-title":"The ozone monitoring instrument","volume":"44","author":"Levelt","year":"2006","journal-title":"IEEE Trans. Geosci. Remote. Sens."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1016\/j.rse.2011.09.027","article-title":"TROPOMI on the ESA Sentinel-5 Precursor: A GMES mission for global observations of the atmospheric composition for climate, air quality and ozone layer applications","volume":"120","author":"Veefkind","year":"2012","journal-title":"Remote Sens. Environ."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2797","DOI":"10.5194\/amt-9-2797-2016","article-title":"Smithsonian Astrophysical Observatory Ozone Mapping and Profiler Suite (SAO OMPS) formaldehyde retrieval","volume":"9","author":"Abad","year":"2016","journal-title":"Atmos. Meas. Tech."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1279","DOI":"10.5194\/amt-9-1279-2016","article-title":"The GOME-2 instrument on the Metop series of satellites: Instrument design, calibration, and level 1 data processing\u2014An overview","volume":"9","author":"Munro","year":"2016","journal-title":"Atmos. Meas. Tech."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"E1","DOI":"10.1175\/BAMS-D-18-0013.1","article-title":"New Era of Air Quality Monitoring from Space: Geostationary Environment Monitoring Spectrometer (GEMS)","volume":"101","author":"Kim","year":"2020","journal-title":"Bull. Am. Meteorol. Soc."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"3551","DOI":"10.5194\/amt-12-3551-2019","article-title":"Description of a formaldehyde retrieval algorithm for the Geostationary Environment Monitoring Spectrometer (GEMS)","volume":"12","author":"Kwon","year":"2019","journal-title":"Atmos. Meas. Tech."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1016\/j.jqsrt.2016.05.008","article-title":"Tropospheric emissions: Monitoring of pollution (TEMPO)","volume":"186","author":"Zoogman","year":"2016","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"10133","DOI":"10.5194\/acp-16-10133-2016","article-title":"Nine years of global hydrocarbon emissions based on source inversion of OMI formaldehyde observations","volume":"16","author":"Bauwens","year":"2016","journal-title":"Atmos. Chem. Phys."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"12519","DOI":"10.5194\/acp-15-12519-2015","article-title":"Diurnal, seasonal and long-term variations of global formaldehyde columns inferred from combined OMI and GOME-2 observations","volume":"15","author":"Stavrakou","year":"2015","journal-title":"Atmos. Chem. Phys."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1289","DOI":"10.5194\/acp-15-1289-2015","article-title":"Evidence for an unidentified non-photochemical ground-level source of formaldehyde in the Po Valley with potential implications for ozone production","volume":"15","author":"Kaiser","year":"2015","journal-title":"Atmos. Chem. Phys."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"7571","DOI":"10.5194\/acp-15-7571-2015","article-title":"Reassessing the ratio of glyoxal to formaldehyde as an indicator of hydrocarbon precursor speciation","volume":"15","author":"Kaiser","year":"2015","journal-title":"Atmos. Chem. Phys."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"7519","DOI":"10.1080\/01431161.2014.968690","article-title":"Remote sensing of atmospheric biogenic volatile organic compounds (BVOCs) via satellite-based formaldehyde vertical column assessments","volume":"35","author":"Kefauver","year":"2014","journal-title":"Int. J. Remote Sens."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"4673","DOI":"10.5194\/acp-17-4673-2017","article-title":"Sensitivity of formaldehyde (HCHO) column measurements from a geostationary satellite to temporal variation of the air mass factor in East Asia","volume":"17","author":"Kwon","year":"2017","journal-title":"Atmos. Chem. Phys."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"225","DOI":"10.1038\/s41586-020-2664-3","article-title":"Satellite isoprene retrievals constrain emissions and atmospheric oxidation","volume":"585","author":"Wells","year":"2020","journal-title":"Nature"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"11171","DOI":"10.1073\/pnas.1821661116","article-title":"Mapping hydroxyl variability throughout the global remote troposphere via synthesis of airborne and satellite formaldehyde observations","volume":"116","author":"Wolfe","year":"2019","journal-title":"Proc. Natl. Acad. Sci. USA"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"8559","DOI":"10.5194\/acp-15-8559-2015","article-title":"Relationships between photosynthesis and formaldehyde as a probe of isoprene emission","volume":"15","author":"Zheng","year":"2015","journal-title":"Atmos. Chem. Phys."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"e2020JD032881","DOI":"10.1029\/2020JD032881","article-title":"Satellite Formaldehyde to Support Model Evaluation","volume":"126","author":"Harkey","year":"2021","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"10439","DOI":"10.1002\/2017JD026720","article-title":"Evaluating a Space-Based Indicator of Surface Ozone-NOx-VOC Sensitivity Over Midlatitude Source Regions and Application to Decadal Trends","volume":"122","author":"Jin","year":"2017","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"6518","DOI":"10.1021\/acs.est.9b07785","article-title":"Inferring Changes in Summertime Surface Ozone\u2013NOx\u2013VOC Chemistry over U.S. Urban Areas from Two Decades of Satellite and Ground-Based Observations","volume":"54","author":"Jin","year":"2020","journal-title":"Environ. Sci. Technol."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"15447","DOI":"10.5194\/acp-21-15447-2021","article-title":"OMI-observed HCHO in Shanghai, China, during 2010\u20132019 and ozone sensitivity inferred by an improved HCHO\/NO2 ratio","volume":"21","author":"Li","year":"2021","journal-title":"Atmos. Chem. Phys."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"D12315","DOI":"10.1029\/2005JD006689","article-title":"Quantifying the seasonal and interannual variability of North American isoprene emissions using satellite observations of the formaldehyde column","volume":"111","author":"Palmer","year":"2006","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"647","DOI":"10.1016\/j.atmosenv.2014.05.061","article-title":"Satellite data of atmospheric pollution for U.S. air quality applications: Examples of applications, summary of data end-user resources, answers to FAQs, and common mistakes to avoid","volume":"94","author":"Duncan","year":"2014","journal-title":"Atmos. Environ."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"105777","DOI":"10.1016\/j.atmosres.2021.105777","article-title":"Evaluating the feasibility of formaldehyde derived from hyperspectral remote sensing as a proxy for volatile organic compounds","volume":"264","author":"Hong","year":"2021","journal-title":"Atmos. Res."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"D24307","DOI":"10.1029\/2004JD004869","article-title":"Evaluation of GOME satellite measurements of tropospheric NO2 and HCHO using regional data from aircraft campaigns in the southeastern United States","volume":"109","author":"Martin","year":"2004","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"2213","DOI":"10.1016\/j.atmosenv.2010.03.010","article-title":"Application of OMI observations to a space-based indicator of NOx and VOC controls on surface ozone formation","volume":"44","author":"Duncan","year":"2010","journal-title":"Atmos. Environ."},{"key":"ref_43","unstructured":"Witman, S., Holloway, T., and Reddy, P.J. (2014). Integrating Satellite Data into Air Quality Management: Experience from Colorado, Air and Waste Management Association."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"4537","DOI":"10.1029\/2003JD003453","article-title":"Global inventory of nitrogen oxide emissions constrained by space-based observations of NO2 columns","volume":"108","author":"Martin","year":"2003","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"D16308","DOI":"10.1029\/2007JD009235","article-title":"Ground-level nitrogen dioxide concentrations inferred from the satellite-borne Ozone Monitoring Instrument","volume":"113","author":"Lamsal","year":"2008","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"11775","DOI":"10.1002\/2015JD023316","article-title":"An evaluation of CMAQ NO2 using observed chemistry-meteorology correlations","volume":"120","author":"Harkey","year":"2015","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"D16S39","DOI":"10.1029\/2007JD009168","article-title":"Comparison of OMI and ground-based in situ and MAX-DOAS measurements of tropospheric nitrogen dioxide in an urban area","volume":"113","author":"Kramer","year":"2008","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"3867","DOI":"10.5194\/acp-9-3867-2009","article-title":"Validation of urban NO2 concentrations and their diurnal and seasonal variations observed from the SCIAMACHY and OMI sensors using in situ surface measurements in Israeli cities","volume":"9","author":"Boersma","year":"2009","journal-title":"Atmos. Chem. Phys."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"1547","DOI":"10.5194\/acp-13-1547-2013","article-title":"Tropospheric NO2 vertical column densities over Beijing: Results of the first three years of ground-based MAX-DOAS measurements (2008\u20132011) and satellite validation","volume":"13","author":"Ma","year":"2013","journal-title":"Atmos. Chem. Phys."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"8413","DOI":"10.5194\/acp-21-8413-2021","article-title":"Global and regional impacts of land cover changes on isoprene emissions derived from spaceborne data and the MEGAN model","volume":"21","author":"Opacka","year":"2021","journal-title":"Atmos. Chem. Phys."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"4825","DOI":"10.5194\/acp-21-4825-2021","article-title":"A long-term estimation of biogenic volatile organic compound (BVOC) emission in China from 2001\u20132016: The roles of land cover change and climate variability","volume":"21","author":"Wang","year":"2021","journal-title":"Atmos. Chem. Phys."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"118095","DOI":"10.1016\/j.atmosenv.2020.118095","article-title":"A decade of satellite observations reveal significant increase in atmospheric formaldehyde from shipping in Indian Ocean","volume":"246","author":"Gopikrishnan","year":"2020","journal-title":"Atmos. Environ."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"4468","DOI":"10.1029\/2019GL082172","article-title":"The 2005\u20132016 Trends of Formaldehyde Columns Over China Observed by Satellites: Increasing Anthropogenic Emissions of Volatile Organic Compounds and Decreasing Agricultural Fire Emissions","volume":"46","author":"Shen","year":"2019","journal-title":"Geophys. Res. Lett."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"015008","DOI":"10.1088\/1748-9326\/ac46eb","article-title":"Spaceborne evidence for significant anthropogenic VOC trends in Asian cities over 2005\u20132019","volume":"17","author":"Bauwens","year":"2022","journal-title":"Environ. Res. Lett."},{"key":"ref_55","doi-asserted-by":"crossref","unstructured":"Guan, J., Jin, B., Ding, Y., Wang, W., Li, G., and Ciren, P. (2021). Global Surface HCHO Distribution Derived from Satellite Observations with Neural Networks Technique. Remote Sens., 13.","DOI":"10.20944\/preprints202105.0595.v2"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"D16308","DOI":"10.1029\/2007JD008950","article-title":"Spatial distribution of isoprene emissions from North America derived from formaldehyde column measurements by the OMI satellite sensor","volume":"113","author":"Millet","year":"2008","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"7079","DOI":"10.1002\/2017GL073859","article-title":"Long-term (2005\u20132014) trends in formaldehyde (HCHO) columns across North America as seen by the OMI satellite instrument: Evidence of changing emissions of volatile organic compounds","volume":"44","author":"Zhu","year":"2017","journal-title":"Geophys. Res. Lett."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"L05813","DOI":"10.1029\/2008GL037090","article-title":"Temperature dependence of factors controlling isoprene emissions","volume":"36","author":"Duncan","year":"2009","journal-title":"Geophys. Res. Lett."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"2205","DOI":"10.1016\/S1352-2310(99)00465-3","article-title":"Natural emissions of non-methane volatile organic compounds, carbon monoxide, and oxides of nitrogen from North America","volume":"34","author":"Guenther","year":"2000","journal-title":"Atmos. Environ."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1111\/j.1399-3054.1979.tb03200.x","article-title":"The Influence of Light and Temperature on Isoprene Emission Rates from Live Oak","volume":"47","author":"Tingey","year":"1979","journal-title":"Physiol. Plant."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"114004","DOI":"10.1088\/1748-9326\/9\/11\/114004","article-title":"Anthropogenic emissions of highly reactive volatile organic compounds in eastern Texas inferred from oversampling of satellite (OMI) measurements of HCHO columns","volume":"9","author":"Zhu","year":"2014","journal-title":"Environ. Res. Lett."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"8464","DOI":"10.1029\/2019GL083757","article-title":"Decreasing Trend in Formaldehyde Detected From 20-Year Record at Wollongong, Southeast Australia","volume":"46","author":"Lieschke","year":"2019","journal-title":"Geophys. Res. Lett."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"1809","DOI":"10.1111\/gcb.15880","article-title":"Vegetation responses to climate extremes recorded by remotely sensed atmospheric formaldehyde","volume":"28","author":"Morfopoulos","year":"2021","journal-title":"Glob. Chang. Biol."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"759","DOI":"10.5194\/amt-10-759-2017","article-title":"Structural uncertainty in air mass factor calculation for NO2 and HCHO satellite retrievals","volume":"10","author":"Lorente","year":"2017","journal-title":"Atmos. Meas. Tech."},{"key":"ref_65","unstructured":"De Smedt, I., Yu, H., Richter, A., Beirle, S., Eskes, H., Boersma, K.F., Van Roozendael, J., Van Geffen, A., Lorente, E., and Peters, E. (2017). QA4ECV HCHO Tropospheric Column Data from OMI, Royal Belgian Institute for Space Aeronomy. (Version 1.1) [Data set]."},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"2395","DOI":"10.5194\/amt-11-2395-2018","article-title":"Algorithm theoretical baseline for formaldehyde retrievals from S5P TROPOMI and from the QA4ECV project","volume":"11","author":"Theys","year":"2018","journal-title":"Atmos. Meas. Tech."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"13477","DOI":"10.5194\/acp-16-13477-2016","article-title":"Observing atmospheric formaldehyde (HCHO) from space: Validation and intercomparison of six retrievals from four satellites (OMI, GOME2A, GOME2B, OMPS) with SEAC4RS aircraft observations over the southeast US","volume":"16","author":"Zhu","year":"2016","journal-title":"Atmos. Chem. Phys."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"4171","DOI":"10.5194\/acp-16-4171-2016","article-title":"Diurnal cycle and multi-decadal trend of formaldehyde in the remote atmosphere near 46\u00b0 N","volume":"16","author":"Franco","year":"2016","journal-title":"Atmos. Chem. Phys."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1016\/j.atmosenv.2015.03.055","article-title":"NO2 trends (2005\u20132013): EPA Air Quality System (AQS) data versus improved observations from the Ozone Monitoring Instrument (OMI)","volume":"110","author":"Lamsal","year":"2015","journal-title":"Atmos. Environ."},{"key":"ref_70","first-page":"8003","article-title":"Evaluation of satellite-derived HCHO using statistical methods","volume":"11","author":"Kim","year":"2011","journal-title":"Atmos. Chem. Phys. Discuss."},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"6219","DOI":"10.5194\/acp-12-6219-2012","article-title":"Isoprene emissions in Africa inferred from OMI observations of formaldehyde columns","volume":"12","author":"Marais","year":"2012","journal-title":"Atmos. Chem. Phys."},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"5650","DOI":"10.1021\/acs.est.7b01356","article-title":"Formaldehyde (HCHO) As a Hazardous Air Pollutant: Mapping Surface Air Concentrations from Satellite and Inferring Cancer Risks in the United States","volume":"51","author":"Zhu","year":"2017","journal-title":"Environ. Sci. Technol."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"1037","DOI":"10.5194\/acp-9-1037-2009","article-title":"Evaluating the performance of pyrogenic and biogenic emission inventories against one decade of space-based formaldehyde columns","volume":"9","author":"Stavrakou","year":"2009","journal-title":"Atmos. Chem. Phys."},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"4438","DOI":"10.1021\/es200050x","article-title":"Photochemical Modeling of the Ozark Isoprene Volcano: MEGAN, BEIS, and Their Impacts on Air Quality Predictions","volume":"45","author":"Carlton","year":"2011","journal-title":"Environ. Sci. Technol."},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1007\/BF00053286","article-title":"Ambient biogenic hydrocarbons and isoprene emissions from a mixed deciduous forest","volume":"25","author":"Fuentes","year":"1996","journal-title":"J. Atmos. Chem."},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"8761","DOI":"10.5194\/acp-10-8761-2010","article-title":"Observations of elevated formaldehyde over a forest canopy suggest missing sources from rapid oxidation of arboreal hydrocarbons","volume":"10","author":"Choi","year":"2010","journal-title":"Atmos. Chem. Phys."},{"key":"ref_77","doi-asserted-by":"crossref","first-page":"1726","DOI":"10.1016\/j.atmosenv.2010.02.009","article-title":"Impacts of boundary layer mixing on pollutant vertical profiles in the lower troposphere: Implications to satellite remote sensing","volume":"44","author":"Lin","year":"2010","journal-title":"Atmos. Environ."},{"key":"ref_78","doi-asserted-by":"crossref","first-page":"3373","DOI":"10.5194\/acp-14-3373-2014","article-title":"On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California","volume":"14","author":"Pusede","year":"2014","journal-title":"Atmos. Chem. Phys."},{"key":"ref_79","doi-asserted-by":"crossref","first-page":"343","DOI":"10.1175\/BAMS-87-3-343","article-title":"North American Regional Reanalysis","volume":"87","author":"Mesinger","year":"2006","journal-title":"Bull. Am. Meteorol. Soc."},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"034008","DOI":"10.1088\/1748-9326\/aa5ef4","article-title":"Timing and seasonality of the United States \u2018warming hole\u2019","volume":"12","author":"Mascioli","year":"2017","journal-title":"Environ. Res. Lett."},{"key":"ref_81","doi-asserted-by":"crossref","first-page":"2055","DOI":"10.1002\/2017GL076463","article-title":"Spatially Distinct Seasonal Patterns and Forcings of the U.S. Warming Hole","volume":"45","author":"Partridge","year":"2018","journal-title":"Geophys. Res. Lett."},{"key":"ref_82","doi-asserted-by":"crossref","first-page":"1391","DOI":"10.1080\/10962247.2019.1668498","article-title":"Methods, availability, and applications of PM2.5 exposure estimates derived from ground measurements, satellite, and atmospheric models","volume":"69","author":"Diao","year":"2019","journal-title":"J. Air Waste Manag. Assoc."},{"key":"ref_83","doi-asserted-by":"crossref","first-page":"12561","DOI":"10.5194\/acp-21-12561-2021","article-title":"Comparative assessment of TROPOMI and OMI formaldehyde observations and validation against MAX-DOAS network column measurements","volume":"21","author":"Pinardi","year":"2021","journal-title":"Atmos. Chem. Phys."},{"key":"ref_84","doi-asserted-by":"crossref","first-page":"3751","DOI":"10.5194\/amt-13-3751-2020","article-title":"TROPOMI\u2013Sentinel-5 Precursor formaldehyde validation using an extensive network of ground-based Fourier-transform infrared stations","volume":"13","author":"Vigouroux","year":"2020","journal-title":"Atmos. Meas. Tech."},{"key":"ref_85","doi-asserted-by":"crossref","first-page":"12329","DOI":"10.5194\/acp-20-12329-2020","article-title":"Validation of satellite formaldehyde (HCHO) retrievals using observations from 12 aircraft campaigns","volume":"20","author":"Zhu","year":"2020","journal-title":"Atmos. Chem. Phys."},{"key":"ref_86","doi-asserted-by":"crossref","first-page":"272","DOI":"10.1016\/j.apr.2020.09.011","article-title":"Spatiotemporal variations and potential sources of tropospheric formaldehyde over eastern China based on OMI satellite data","volume":"12","author":"Fan","year":"2020","journal-title":"Atmos. Pollut. Res."},{"key":"ref_87","first-page":"1","article-title":"Plant-specific volatile organic compound emission rates from young and mature leaves of Mediterranean vegetation","volume":"116","author":"Welter","year":"2011","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_88","unstructured":"U.S. Environmental Protection Agency (2022, April 21). Technical Note\u2014Guidance for Developing Enhanced Monitoring Plans, Available online: https:\/\/www.epa.gov\/sites\/default\/files\/2019-11\/documents\/pams_emp_guidance.pdf."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/14\/9\/2191\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T23:05:53Z","timestamp":1760137553000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/14\/9\/2191"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,5,4]]},"references-count":88,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2022,5]]}},"alternative-id":["rs14092191"],"URL":"https:\/\/doi.org\/10.3390\/rs14092191","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,5,4]]}}}