How are NAAQS determined?

The National Ambient Air Quality Standards (NAAQS) are determined by how much of the following pollutants are present in the air:

• Lead 
• Carbon monoxide
• Ozone 
• Nitrogen dioxide
• Sulfur dioxide

National Ambient Air Quality Standards are limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health hazards.

For more relevant articles refer to the links given below:

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