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We evaluate satellite\u2010derived gridded data sets for fine particulate matter (PM\n                    <jats:sub>2.5<\/jats:sub>\n                    ), as a possible method to support the ALA assessment in counties without regulatory monitors. Our analysis compares two publicly available, annual average, satellite\u2010derived gridded PM\n                    <jats:sub>2.5<\/jats:sub>\n                    data sets, allocated to U.S. counties using three different methods. Assigning the 90th percentile gridded value of PM\n                    <jats:sub>2.5<\/jats:sub>\n                    within a county as the county\u2010level indicator yields moderately strong agreement between ground\u2010based monitor PM\n                    <jats:sub>2.5<\/jats:sub>\n                    results and satellite\u2010derived PM\n                    <jats:sub>2.5<\/jats:sub>\n                    results, with a spatial correlation coefficient of 0.76 for 8\u00a0years of Washington University global (WashU GL) data. This agreement is evaluated with respect to concentration values, rankings, and the definition of counties as \u201cpassing\u201d or \u201cfailing\u201d the ALA annual PM\n                    <jats:sub>2.5<\/jats:sub>\n                    benchmark of 9.0\u00a0\u03bcg\/m\n                    <jats:sup>3<\/jats:sup>\n                    (the 2024 EPA National Ambient Air Quality Standard for annual PM\n                    <jats:sub>2.5<\/jats:sub>\n                    ). While most unmonitored counties are \u201cpassing\u201d the ALA benchmark, we identify 63 counties that would be classified as \u201cfailing\u201d if satellite\u2010based data were used to assign ALA grades. Improving methods to analyze satellite\u2010derived data for comparison with monitor\u2010based metrics can support broader utilization of space\u2010based data in the U.S. and globally.\n                  <\/jats:p>","DOI":"10.1029\/2025gh001585","type":"journal-article","created":{"date-parts":[[2026,7,7]],"date-time":"2026-07-07T13:00:36Z","timestamp":1783429236000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Applying Satellite\u2010Derived PM\n                    <sub>2.5<\/sub>\n                    Data to Policy\u2010Relevant Air Quality Metrics"],"prefix":"10.1029","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8488-408X","authenticated-orcid":false,"given":"Tracey","family":"Holloway","sequence":"first","affiliation":[{"name":"Nelson Institute Center for Sustainability and the Global Environment University of Wisconsin\u2014Madison  Madison WI USA"},{"name":"Department of Atmospheric and Oceanic Sciences University of Wisconsin\u2014Madison  Madison WI USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-8688-0663","authenticated-orcid":false,"given":"Summer","family":"Acker","sequence":"additional","affiliation":[{"name":"Nelson Institute Center for Sustainability and the Global Environment University of Wisconsin\u2014Madison  Madison WI USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lizzy","family":"Kysela","sequence":"additional","affiliation":[{"name":"Nelson Institute Center for Sustainability and the Global Environment University of Wisconsin\u2014Madison  Madison WI USA"},{"name":"Department of Atmospheric and Oceanic Sciences University of Wisconsin\u2014Madison  Madison WI USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Colleen","family":"Heck","sequence":"additional","affiliation":[{"name":"Nelson Institute Center for Sustainability and the Global Environment University of Wisconsin\u2014Madison  Madison WI USA"},{"name":"Department of Atmospheric and Oceanic Sciences University of Wisconsin\u2014Madison  Madison WI USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aaron","family":"van Donkelaar","sequence":"additional","affiliation":[{"name":"Department of Energy Environmental &amp; Chemical Engineering Washington University in St. Louis  St. Louis MO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2632-8402","authenticated-orcid":false,"given":"Randall V.","family":"Martin","sequence":"additional","affiliation":[{"name":"Department of Energy Environmental &amp; Chemical Engineering Washington University in St. Louis  St. Louis MO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-0057-7032","authenticated-orcid":false,"given":"Kevin M.","family":"Stewart","sequence":"additional","affiliation":[{"name":"American Lung Association  Chicago IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katherine","family":"Pruitt","sequence":"additional","affiliation":[{"name":"American Lung Association  Chicago IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"13","published-online":{"date-parts":[[2026,7,7]]},"reference":[{"key":"e_1_2_8_1_2_1","doi-asserted-by":"publisher","DOI":"10.1029\/2025GH001586"},{"key":"e_1_2_8_1_3_1","unstructured":"ALA. 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