The air quality index for ten cities include:
1. Delhi, India (AQI: 556)
2. Lahore, Pakistan (AQI: 354)
3. Sofia, Bulgaria (AQI: 178)
4. Kolkata, India (AQI: 177)
5. Zagreb, Croatia (AQI: 173)
6. Mumbai, India (AQI: 169)
7. Belgrade, Serbia (AQI: 165)
8. Chengdu, China (AQI: 165)
9. Skopje, North Macedonia (AQI: 164)
10. Krakow, Poland (AQI: 160)
It should be noted that the air quality index, also known as AQI, is the system that is used to warn the public when the air pollution is dangerous.
In this case, the AQI tracks ozone and particle pollution that is the particles from ash, factories, vehicle exhaust, soil dust,, and other pollution.
Also, the air quality index is calculated based on the averages of all pollutant concentrations that are measured in a full hour or a full day.
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