 Satellite observations of NH3 from 2 sensors (IASI, CrIS) are used to estimate UK NH3 emissions in Mar-Sep at fine scales (10 km, monthly)  Satellite-derived NH3 emissions total 272 Gg from IASI and 389 Gg from CrIS and exhibit a spring (April) and summer (July) peak  Bottom-up emissions used for research and policy are 27-49% less than the satellitederived estimates and miss the summer emissions peak Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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