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September 2020
China
2013 and 2017
All provincial capital cities and directly administered cities in China are included in the given table.
Days with polluted air refers to all days with an Air Quality Index (AQI) worse or equal to grade 3.
The air quality index (AQI) in China has six levels based on the amounts of six atmospheric pollutants. Up to level two, air quality is considered acceptable.
AQI levels:
1. Excellent (0-50)
2. Good (51-100)
3. Lightly polluted (101-150)
4. Moderately polluted (151-200)
5. Heavily polluted (201-300)
6. Severely polluted (> 300).
The source does not provide a release date. The date given is the date of data access.
