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What Is The Air Quality Index?

June 25, 2019

The Air Quality Index (AQI) is a measure used by environmental agencies and other public bodies around the world to measure how clean the air is.

The lower the index is, the better the quality of the air.

The AQI provides a number which is easy to compare between different pollutants, locations, and time periods.

Exactly how this score is categorised varies from country to country, but each category in the AQI corresponds to a different level of health risk.

The daily results of the index are used to convey to the public an estimate of air pollution level. 

The AQI provides a number which is easy to compare between different pollutants, locations, and time periods. Exactly how this score is categorised varies from country to country, but each category in the AQI corresponds to a different level of health risk.

An increase in air quality index signifies increased air pollution and severe threats to human health. 

The AQI centres on the health effects that may be experienced within a few days or hours after breathing polluted air.

AQI calculations focus on major air pollutants including: particulate matter, ground-level ozone, sulfur dioxide, nitrogen dioxide, and carbon monoxide.

Particulate matter and ozone pollutants pose the highest risks to human health and the environment. 

For each of these air pollutant categories, different countries have their own established air quality indices in relation to other nationally set air quality standards for public health protection.