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Emissions of nitrogen oxides to the atmosphere lead to the formation of ozone and particulate matter, with adverse impacts on human health and ecosystems. The effects of emissions are often assessed through modeling based on inventories relying on indirect information that is often outdated or incomplete. Here we show that NO<jats:sub>2<\/jats:sub> measurements from the new, high-resolution TROPOMI satellite sensor can directly determine the strength and distribution of emissions from Paris. From the observed build-up of NO<jats:sub>2<\/jats:sub> pollution, we find highest emissions on cold weekdays in February 2018, and lowest emissions on warm weekend days in spring 2018. The new measurements provide information on the spatio-temporal distribution of emissions within a large city, and suggest that Paris emissions in 2018 are only 5\u201315% below inventory estimates for 2011\u20132012, reflecting the difficulty of meeting NO<jats:sub>x<\/jats:sub> emission reduction targets.<\/jats:p>","DOI":"10.1038\/s41598-019-56428-5","type":"journal-article","created":{"date-parts":[[2019,12,27]],"date-time":"2019-12-27T11:02:42Z","timestamp":1577444562000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":182,"title":["Quantification of nitrogen oxides emissions from build-up of pollution over Paris with TROPOMI"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2287-4687","authenticated-orcid":false,"given":"A.","family":"Lorente","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. 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