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PM2.5 PM10 CO SO₂ NO₂ O³
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Air Rank of Chinese Cities

Monthly Average PM2.5 ( China )

Monthly Average PM2.5 ( China )

Air Quality Index

An air quality index (AQI) is used by government agencies[1] to communicate to the public how polluted the air currently is or how polluted it is forecast to become.[2][3] Public health risks increase as the AQI rises. Different countries have their own air quality indices, corresponding to different national air quality standards.

AQI Air Pollution Category Health Implications
0-50 Excellent No health implications.
51-100 Good Some pollutants may slightly affect very few hypersensitive individuals.
101-150 Lightly Polluted Healthy people may experience slight irritations and sensitive individuals will be slightly affected to a larger extent.
151-200 Moderately Polluted Sensitive individuals will experience more serious conditions. The hearts and respiratory systems of healthy people may be affected.
201-300 Heavily Polluted Healthy people will commonly show symptoms. People with respiratory or heart diseases will be significantly affected and will experience reduced endurance in activities.
300+ Severely Polluted Healthy people will experience reduced endurance in activities and may also show noticeably strong symptoms. Other illnesses may be triggered in healthy people. Elders and the sick should remain indoors and avoid exercise. Healthy individuals should avoid outdoor activities.

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Air quality source: CNEMC