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The term air quality index (AQI) are used by government agencies as a way to communicate with the public about the current level of air pollution that is expected to occur. When the AQI index increases, a large part of the region's population with polluted air is likely to experience health problems. Different countries are now using the set of criteria and the formula for calculating air quality separately. Corresponds to the air quality standards issued according to national standards.

Source: https://en.wikipedia.org/wiki/Air_quality_index

The AQI index is usually calculated based on the index of the 5 largest air pollutants, include: Ozone layer (O3), fine dust pollution (PM2.5, PM10 - also known as particulate matter), carbon monoxide , sulfur dioxide (SO2) and nitrogen dioxide (NO2). After applying the calculation formula, give the value with AQI of each parameter, the displayed AQI value will be the largest AQI value for the five parameters in the specified unit of time (1 hour and 1 day).