{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,23]],"date-time":"2026-04-23T19:45:40Z","timestamp":1776973540179,"version":"3.51.4"},"reference-count":56,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2019,5,31]],"date-time":"2019-05-31T00:00:00Z","timestamp":1559260800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Xunta de Galicia\/FEDER","award":["ED431B 2017\/64"],"award-info":[{"award-number":["ED431B 2017\/64"]}]},{"name":"European Union H2020","award":["H2020-SwafS-2018-1-824603"],"award-info":[{"award-number":["H2020-SwafS-2018-1-824603"]}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UID\/MULTI\/00611\/2019"],"award-info":[{"award-number":["UID\/MULTI\/00611\/2019"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","award":["POCI-01-0145-FEDER-006922"],"award-info":[{"award-number":["POCI-01-0145-FEDER-006922"]}],"id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sustainability"],"abstract":"<jats:p>Monitoring long-term trends in the evolution of the anthropogenic night sky brightness is a demanding task due to the high dynamic range of the artificial and natural light emissions and the high variability of the atmospheric conditions that determine the amount of light scattered in the direction of the observer. In this paper, we analyze the use of a statistical indicator, the mFWHM, to assess the night sky brightness changes over periods of time larger than one year. The mFWHM is formally defined as the average value of the recorded magnitudes contained within the full width at half-maximum region of the histogram peak corresponding to the scattering of artificial light under clear skies in the conditions of a moonless astronomical night (sun below \u221218\u00b0, and moon below \u22125\u00b0). We apply this indicator to the measurements acquired by the 14 SQM detectors of the Galician Night Sky Brightness Monitoring Network during the period 2015\u20132018. Overall, the available data suggest that the zenithal readings in the Sky Quality Meter (SQM) device-specific photometric band tended to increase during this period of time at an average rate of +0.09 magSQM\/arcsec2 per year.<\/jats:p>","DOI":"10.3390\/su11113070","type":"journal-article","created":{"date-parts":[[2019,5,31]],"date-time":"2019-05-31T11:59:56Z","timestamp":1559303996000},"page":"3070","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Monitoring Long-Term Trends in the Anthropogenic Night Sky Brightness"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1274-8043","authenticated-orcid":false,"given":"Salvador","family":"Bar\u00e1","sequence":"first","affiliation":[{"name":"Departmento F\u00edsica Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7212-510X","authenticated-orcid":false,"given":"Raul C.","family":"Lima","sequence":"additional","affiliation":[{"name":"Physics, School of Health of the Polytechnic Institute of Porto, 4200-072 Porto, Portugal"},{"name":"CITEUC\u2014Centre for Research on Earth and Space of the University of Coimbra, Observat\u00f3rio Astron\u00f3mico da Universidade de Coimbra, 3030-004 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8993-5894","authenticated-orcid":false,"given":"Jaime","family":"Zamorano","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica de la Tierra y Astrof\u00edsica, Instituto de F\u00edsica de Part\u00edculas y del Cosmos (IPARCOS), Universidad Complutense de Madrid, 28040 Madrid, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2019,5,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1890\/1540-9295(2004)002[0191:ELP]2.0.CO;2","article-title":"Ecological light pollution","volume":"2","author":"Longcore","year":"2004","journal-title":"Front. Ecol. Environ."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"681","DOI":"10.1016\/j.tree.2010.09.007","article-title":"Light pollution as a biodiversity threat","volume":"25","author":"Wolter","year":"2010","journal-title":"Trends Ecol. Evol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"917","DOI":"10.1007\/s00442-014-3088-2","article-title":"Human alteration of natural light cycles: Causes and ecological consequences","volume":"176","author":"Gaston","year":"2014","journal-title":"Oecologia"},{"key":"ref_4","unstructured":"Organisation for Economic Co-operation and Development (OECD), and International Energy Agency (IEA) (2006). Light\u2019s Labour\u2019s Lost\u2014Policies for Energy-Efficient Lighting, OECD\/IEA."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"658","DOI":"10.1016\/j.ecolecon.2009.10.003","article-title":"The economics of global light pollution","volume":"69","author":"Gallaway","year":"2010","journal-title":"Ecol. Econ."},{"key":"ref_6","unstructured":"Mar\u00edn, C., and Jafari, J. (2008). StarLight: A Common Heritage, StarLight Initiative La Palma Biosphere Reserve, Instituto De Astrof\u00edsica De Canarias, Government of The Canary Islands, Spanish Ministry of The Environment, UNESCO-MaB."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"588","DOI":"10.1016\/j.mehy.2004.03.020","article-title":"Lighting for the human circadian clock: Recent research indicates that lighting has become a public health issue","volume":"63","author":"Pauley","year":"2004","journal-title":"Med. Hypotheses"},{"key":"ref_8","unstructured":"IARC (International Agency for Research on Cancer) (2010). Painting, Firefighting, and Shiftwork: IARC Monographs on the Evaluation of Carcinogenic Risks to Humans, World Health Organization."},{"key":"ref_9","unstructured":"AMA (American Medical Association) (2012, January 16\u201320). Light Pollution: Adverse health effects of nighttime lighting. Proceedings of the American Medical Association House of Delegates, 161st Annual Meeting, Chicago, IL, USA."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Haim, A., and Portnov, B. (2013). Light Pollution as a New Risk Factor for Human Breast and Prostate Cancers, Springer.","DOI":"10.1007\/978-94-007-6220-6"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"648","DOI":"10.1210\/er.2013-1051","article-title":"The Effects of Light at Night on Circadian Clocks and Metabolism","volume":"35","author":"Fonken","year":"2014","journal-title":"Endocr. Rev."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"295","DOI":"10.1515\/jbcpp-2016-0116","article-title":"Artificial light-at-night\u2014A novel lifestyle risk factor for metabolic disorder and cancer morbidity","volume":"28","author":"Zubidat","year":"2017","journal-title":"J. Basic Clin. Physiol. Pharmacol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"94","DOI":"10.1016\/j.lfs.2017.02.008","article-title":"Association between light at night, melatonin secretion, sleep deprivation, and the internal clock: Health impacts and mechanisms of circadian disruption","volume":"173","author":"Touitou","year":"2017","journal-title":"Life Sci."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1016\/j.physbeh.2017.08.029","article-title":"Light at night as an environmental endocrine disruptor","volume":"190","author":"Russart","year":"2018","journal-title":"Physiol. Behav."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"5860","DOI":"10.1080\/01431161.2017.1342050","article-title":"VIIRS night-time lights","volume":"38","author":"Elvidge","year":"2017","journal-title":"Int. J. Remote Sens."},{"key":"ref_16","unstructured":"Pelton, J.N., Madry, S., and Camacho-Lara, S. (2017). Astronaut Photography: Handheld Camera Imagery from Low Earth Orbit. Handbook of Satellite Applications, Springer International Publishing."},{"key":"ref_17","unstructured":"S\u00e1nchez de Miguel, A. (2015). Spatial, Temporal and Spectral Variation of the Light Pollution and its Sources: Methodology and Results. [Ph.D. Thesis, Universidad Complutense de Madrid]."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"689","DOI":"10.1046\/j.1365-8711.2001.04882.x","article-title":"The first world atlas of the artificial night sky brightness","volume":"328","author":"Cinzano","year":"2001","journal-title":"Mon. Not. R. Astron. Soc."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"e1600377","DOI":"10.1126\/sciadv.1600377","article-title":"The new world atlas of artificial night sky brightness","volume":"2","author":"Falchi","year":"2016","journal-title":"Sci. Adv."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"160541","DOI":"10.1098\/rsos.160541","article-title":"Anthropogenic disruption of the night sky darkness in urban and rural areas","volume":"3","year":"2016","journal-title":"R. Soc. Open Sci."},{"key":"ref_21","unstructured":"(2019, April 25). Globe at Night. Available online: https:\/\/www.globeatnight.org\/."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1016\/j.jqsrt.2017.09.008","article-title":"Measuring night sky brightness: Methods and challenges","volume":"205","author":"Posch","year":"2018","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_23","first-page":"49","article-title":"STARS4ALL Night Sky Brightness Photometer","volume":"35","author":"Zamorano","year":"2016","journal-title":"Int. J. Sustain. Light."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Bar\u00e1, S., Tapia, C.E., and Zamorano, J. (2019). Absolute Radiometric Calibration of TESS-W and SQM Night Sky Brightness Sensors. Sensors, 19.","DOI":"10.3390\/s19061336"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1835","DOI":"10.1038\/srep01835","article-title":"Citizen Science Provides Valuable Data for Monitoring GlobalNight Sky Luminance","volume":"3","author":"Kyba","year":"2013","journal-title":"Sci. Rep."},{"key":"ref_26","unstructured":"CIE (Commission Internationale de l\u2019Eclairage) (1990). CIE 1988 2\u00b0 Spectral Luminous Efficiency Function for Photopic Vision, CIE."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1146\/annurev.astro.41.082801.100251","article-title":"Standard Photometric Systems","volume":"43","author":"Bessell","year":"2005","journal-title":"Annu. Rev. Astron. Astrophys."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1076","DOI":"10.1086\/661918","article-title":"An all-sky transmission monitor: ASTMON","volume":"123","author":"Aceituno","year":"2001","journal-title":"Publ. Astron. Soc. Pac."},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Jechow, A., Koll\u00e1th, Z., Lerner, A., H\u00f6lker, F., H\u00e4nel, A., Shashar, N., and Kyba, CCM (2017, March 22). Measuring Light Pollution with Fisheye Lens Imagery from A Moving Boat, A Proof of Concept. Available online: https:\/\/arxiv.org\/abs\/1703.08484.","DOI":"10.26607\/ijsl.v19i1.62"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"212","DOI":"10.1016\/j.jqsrt.2018.01.032","article-title":"Tracking the dynamics of skyglow with differential photometry using a digital camera with fisheye lens","volume":"209","author":"Jechow","year":"2018","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Jechow, A. (2019). Observing the Impact of WWF Earth Hour on Urban Light Pollution: A Case Study in Berlin 2018 Using Differential Photometry. Sustainability, 11.","DOI":"10.3390\/su11030750"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"61","DOI":"10.26607\/ijsl.v19i1.70","article-title":"Night sky quality monitoring in existing and planned dark sky parks by digital cameras","volume":"19","year":"2017","journal-title":"Int. J. Sustain. Light."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1391","DOI":"10.1038\/s41598-018-37817-8","article-title":"Using all-sky differential photometry to investigate how nocturnal clouds darken the night sky in rural areas","volume":"9","author":"Jechow","year":"2019","journal-title":"Sci. Rep."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"104","DOI":"10.26607\/ijsl.v19i2.77","article-title":"Variations on a classical theme: On the formal relationship between magnitudes per square arcsecond and luminance","volume":"19","year":"2017","journal-title":"Int. J. Sustain. Light."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1016\/j.jqsrt.2013.08.019","article-title":"Night sky photometry and spectroscopy performed at the Vienna University Observatory","volume":"139","author":"Puschnig","year":"2014","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"76","DOI":"10.1016\/j.jqsrt.2013.12.011","article-title":"The night sky brightness at Potsdam-Babelsberg including overcast and moonlit conditions","volume":"139","author":"Puschnig","year":"2014","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"8409","DOI":"10.1038\/srep08409","article-title":"Worldwide variations in artificial skyglow","volume":"5","author":"Kyba","year":"2015","journal-title":"Sci. Rep."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"144","DOI":"10.1016\/j.jqsrt.2018.03.010","article-title":"Systematic measurements of the night sky brightness at 26 locations in Eastern Austria","volume":"211","author":"Posch","year":"2018","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1722","DOI":"10.1038\/srep01722","article-title":"Artificial light alters natural regimes of night-time sky brightness","volume":"3","author":"Davies","year":"2013","journal-title":"Sci. Rep."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"e1701528","DOI":"10.1126\/sciadv.1701528","article-title":"Artificially lit surface of Earth at night increasing in radiance and extent","volume":"3","author":"Kyba","year":"2017","journal-title":"Sci. Adv."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1016\/j.is.2015.06.002","article-title":"Dynamics of the urban nightscape","volume":"54","author":"Dobler","year":"2015","journal-title":"Inf. Syst."},{"key":"ref_42","unstructured":"Bar\u00e1, S., Rodr\u00edguez-Ar\u00f3s, A., P\u00e9rez, M., Tosar, B., Lima, R.C., S\u00e1nchez de Miguel, A., and Zamorano, J. (2018). Estimating the relative contribution of streetlights, vehicles, and residential lighting to the urban night sky brightness. Light. Res. Technol."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"11","DOI":"10.26607\/ijsl.v19i2.82","article-title":"Temporal profiles of urban lighting: Proposal for a research design and first results from three sites in Berlin","volume":"20","author":"Meier","year":"2018","journal-title":"Int. J. Sustain. Light."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"701","DOI":"10.1111\/j.1365-2966.2012.21559.x","article-title":"Red is the new black: How the colour of urban skyglow varies with cloud cover","volume":"425","author":"Kyba","year":"2012","journal-title":"Mon. Not. R. Astron. Soc."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"32","DOI":"10.26607\/ijsl.v18i0.19","article-title":"How Clouds are Amplifying (or not) the Effects of ALAN","volume":"35","author":"Ribas","year":"2016","journal-title":"Int. J. Sustain. Light."},{"key":"ref_46","unstructured":"Ribas, S.J. (2017). Caracteritzaci\u00f3 de la contaminaci\u00f3 lum\u00ednica en zones protegides i urbanes. [Ph.D. Thesis, Universitat de Barcelona]. Available online: http:\/\/www.tdx.cat\/handle\/10803\/396095."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"51","DOI":"10.26607\/ijsl.v20i2.87","article-title":"Photons without borders: Quantifying light pollution transfer between territories","volume":"20","author":"Lima","year":"2018","journal-title":"Int. J. Sustain. Light."},{"key":"ref_48","unstructured":"(2019, April 20). MeteoGalicia, Main Page. Available online: https:\/\/www.meteogalicia.gal."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"2537","DOI":"10.1007\/s10661-011-2136-1","article-title":"Night-sky brightness monitoring in Hong Kong","volume":"184","author":"Pun","year":"2012","journal-title":"Environ. Monit. Assess."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1177\/1477153513515508","article-title":"Initial Irish light pollution measurements and a new sky quality meter-based data logger","volume":"46","author":"Espey","year":"2014","journal-title":"Light. Res. Technol."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1080\/15287394.2016.1153446","article-title":"Light Pollution: Assessment of Sky Glow on two Dark Sky Regions of Portugal","volume":"79","author":"Lima","year":"2016","journal-title":"J. Toxicol. Environ. Health Part A"},{"key":"ref_52","unstructured":"Zamorano, J., de Miguel, A.S., Nievas, M., Tapia, C., Oca\u00f1a, F., Izquierdo, J., Gallego, J., Pascual, S., Colomer, F., and Bar\u00e1, S. (2019, March 11). Light Pollution Spanish REECL SQM Network. XXIX IAU FM 21: Mitigating Threats of Light Pollution & Radio Frequency Interference, Honolulu (Hawaii) 3-14\/8\/2015. Available online: https:\/\/www.noao.edu\/education\/files\/Zamorano_IAU2015_REECL-SQM.pdf."},{"key":"ref_53","unstructured":"MeteoGalicia (2019, April 20). Brillo do ceo nocturno. Available online: https:\/\/www.meteogalicia.gal\/Caire\/brillodoceo.action."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"9466","DOI":"10.3390\/s150409466","article-title":"Stability of the Nine Sky Quality Meters in the Dutch Night Sky Brightness Monitoring Network","volume":"15","author":"Lolkema","year":"2015","journal-title":"Sensors"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1016\/j.jqsrt.2018.04.028","article-title":"A simplified model of all-sky artificial sky glow derived from VIIRS Day\/Night band data","volume":"21","author":"Duriscoe","year":"2018","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"2966","DOI":"10.1093\/mnras\/stx145","article-title":"Sky Quality Meter measurements in a colour-changing world","volume":"467","author":"Zamorano","year":"2017","journal-title":"Mon. Not. R. Astron. Soc."}],"container-title":["Sustainability"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2071-1050\/11\/11\/3070\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T12:54:55Z","timestamp":1760187295000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2071-1050\/11\/11\/3070"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,5,31]]},"references-count":56,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2019,6]]}},"alternative-id":["su11113070"],"URL":"https:\/\/doi.org\/10.3390\/su11113070","relation":{},"ISSN":["2071-1050"],"issn-type":[{"value":"2071-1050","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,5,31]]}}}