What are the 6 air quality index categories?

The air quality index has the following categories:

• Good
• Satisfactory
• Moderately polluted
• Poor
• Very Poor
• Severe.

The measurement of air quality is based on eight pollutants, namely,

• Particulate Matter (size less than 10 µm)
• Particulate Matter (size less than 2.5 µm)
• Nitrogen Dioxide (NO2)
• Sulphur Dioxide (SO2)
• Carbon Monoxide (CO)
• Ozone (O3)
• Ammonia (NH3)
• Lead (Pb)

For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• National Clean Air Programme
• UPSC Environment and Ecology