Frontiers | Climate change and human activity impacts on future flood risk in the Pearl River Delta based on the MaxEnt model,コロナで大気汚染が急減、科学者も驚く効果 - WSJ,ウクライナ東部で墜落したマレーシア機の残骸 - WSJ,Co-occurrence of ozone and PM2.5 pollution in the Yangtze River Delta over 2013–2019: Spatiotemporal distribution and meteorological conditions - ScienceDirect