Spatiotemporal Big Data for PM_2.5 Exposure and Health Risk Assessment during COVID-19.

In April 2020, the maximum population density areas of large cities were concentrated in the Jing-Jin-Ji urban agglomerations, the Yangtze River Delta, the Pearl River Delta, the Chengdu-Chongqing urban agglomeration, Wuhan and Changsha, with an increasing trend compared to March 2020, but there is still a gap compared to the population density in January 2020, and with the state’s push for enterprises to resume work and production, most of the enterprises have started production activities in April 2020, and the population density range has an increasing trend in the first-tier and new first-tier cities.

also in 63,971 other papers