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To reduce the concentrations of pollutants, air pollution control policies have been successfully implemented, resulting in the gradual decrease of air pollution in China during the last decade, as evidenced from both satellite and ground-based measurements. The aims of the Dragon 4 project \u201cAir quality over China\u201d were the determination of trends in the concentrations of aerosols and trace gases, quantification of emissions using a top-down approach and gain a better understanding of the sources, transport and underlying processes contributing to air pollution. This was achieved through (a) satellite observations of trace gases and aerosols to study the temporal and spatial variability of air pollutants; (b) derivation of trace gas emissions from satellite observations to study sources of air pollution and improve air quality modeling; and (c) study effects of haze on air quality. In these studies, the satellite observations are complemented with ground-based observations and modeling.<\/jats:p>","DOI":"10.3390\/rs13173542","type":"journal-article","created":{"date-parts":[[2021,9,6]],"date-time":"2021-09-06T21:47:38Z","timestamp":1630964858000},"page":"3542","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Air Quality over China"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1649-6333","authenticated-orcid":false,"given":"Gerrit","family":"de Leeuw","sequence":"first","affiliation":[{"name":"KNMI (Royal Netherlands Meteorological Institute), 3730AE De Bilt, The Netherlands"},{"name":"Aerospace Information Research Institute, Chinese Academy of Sciences (AirCAS), No. 20 Datun Road, Chaoyang District, Beijing 100101, China"},{"name":"School of Atmospheric Physics, Nanjing University of Information Science & Technology (NUIST), No. 219 Ningliu Road, Nanjing 210044, China"},{"name":"School of Environment Science and Spatial Informatics, China University of Mining and Technology (CUMT), Xuzhou 221116, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronald","family":"van der A","sequence":"additional","affiliation":[{"name":"KNMI (Royal Netherlands Meteorological Institute), 3730AE De Bilt, The Netherlands"},{"name":"School of Atmospheric Physics, Nanjing University of Information Science & Technology (NUIST), No. 219 Ningliu Road, Nanjing 210044, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianhui","family":"Bai","sequence":"additional","affiliation":[{"name":"LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP, CAS), Beijing 100029, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Xue","sequence":"additional","affiliation":[{"name":"School of Environment Science and Spatial Informatics, China University of Mining and 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