Changes in China PM2.5 during the COVID

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Based on visualization:

In the first half of 2019, the degree of PM2.5 in the central east and northwest was still very high. Maybe because of coal burning for heating. In the Second half of 2020, pollution conditions have become much better.

Compared with 2019, in 2020 (The second year of Covid), the whole condition become much better. It can be seen that the area of the red polluted part of the relatively developed region in the east is significantly smaller compared to 2019.