Spatiotemporal variations and potential sources of tropospheric formaldehyde over eastern China based on OMI satellite data

The eastern region is an important economic hinterland and energy of China; however, the rapid development decoupling environmental pressure have resulted in a significant increase volatile organic compound (VOC) emissions, facing air pollution problem high-concentration formaldehyde accumulation. Aura/Ozone Monitoring Instrument (OMI) remote sensing satellite can perform long-term large-scale dynamic monitoring tropospheric formaldehyde, its data reflect distribution column concentration study area. This article discusses spatial temporal characteristics China from 2009 to 2018 based on OMI's daily products. In addition, Multi-resolution Emission Inventory for (MEIC), potential contributions natural sources (isoprene) anthropogenic (industrial sources, transportation residential sources) are analyzed. results show that higher China, high-value areas mainly concentrated regions with close human activities, such as Jing-Jin-Ji (JJJ), Yangtze River Delta (YRD), Pearl (PRD), predicted slowly future. One main isoprene emitted by plants, but impact activities cannot be ignored. OMI objectively spatiotemporal distributions change large effectively characterize accumulation atmospheric pollutants; thus, use provide theoretical basis reference value improvement regional ecological environment quality.