SATELLITE-BASED CHINA’S PM_2.5 POLLUTION AND ASSOCIATED PREMATURE MORTALITY MEASUREMENT OVER PAST TWO DECADES

The systematic validation and comparison of MAIAC, DT, and DB AOD products across China from 2000 to 2017 is presented. In this process, the overall accuracy, land type dependence, view geometry dependence, spatiotemporal retrieval accuracy, spatial variation pattern, and spatiotemporal completeness of the three products are analyzed in detail. In general, MAIAC achieves higher accuracy than DT and DB, but DT and DB may perform better than MAIAC under some specific land cover types or seasons.

This study presents strategies of method selection for 100 m scale PM_2.5 mapping using a crowdsourced sampling campaign. Interestingly, PM_2.5 concentrations in micro-environments varied significantly in intra-urban areas. These local PM_2.5 variations can be effectively revealed by crowdsourcing sampling rather than national air quality monitoring sites. The selection of models for fine-scale PM_2.5 mapping should be adjusted with the changing sampling and pollution circumstances.