Figure 1
From: The impacts of COVID-19, meteorology, and emission control policies on PM2.5 drops in Northeast Asia
Monthly average change trends of PM2.5 concentration observed in China and South Korea in 2016 to 2020. (a) From December to March (b) December and January, and (c) February and March. The blue and black lines represent the observed PM2.5 concentrations in South Korea and China, respectively.
