Air Quality Index:

PM2.5 NO2 20/19 PM2.5 20/19 NO2

Week-to-week comparison of PM2.5 concentration over the world between 2020 and 2019 since the 1st week of February in each year. The values are percentage changes for a week in 2020 compared to the same week in 2019. A positive value means PM2.5 concentration has increased in 2020 whereas a negative value means it has decreased. Data latest as of April 23, 2020. Data as per

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