Indian National Ambient Air Quality standards stipulate the maximum permissible limit of annual mean concentration of PM2.5 to be

Question

Question

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Answer 1

National Ambient Air Quality Standards are standardized air quality standards for the entire country.

Key Points

The Central Pollution Control Board (CPCB) is empowered to establish standards for the quality of the air under the Air (Prevention and Control of Pollution) Act.
In 2009, the CPCB declared the current National Ambient Air Quality Standards.
The 2009 standards uniformized the national standards and considerably reduced the maximum allowed values for contaminants.
According to 2009 standards, National Ambient Air Quality standards stipulate the maximum permissible limit of the annual mean concentration of PM2.5 to be 40 μg/m3.

Thus, Indian National Ambient Air Quality standards stipulate the maximum permissible limit of the annual mean concentration of PM2.5 to be 40 μg/m3.

Additional Information

Pollutant	Averaging time	Recommended concentration as per NAAQS 2009
PM2.5 μg/m³	Annual	40
PM2.5 μg/m³	24-hour	60
PM10 μg/m³	Annual	60
PM10 μg/m³	24-hour	100
O₃ μg/m³	8-hour	100
NO₂ μg/m³	Annual	40
NO₂ μg/m³	24-hour	80
SO₂ μg/m³	Annual	50
SO₂ μg/m³	24-hour	80
CO μg/m³	8-hour	2