400 is a possible measurement of the AQI.
An indicator of how clean or dirty the air is is its quality. Because filthy air may be harmful to both human health and the health of the ecosystem, it is crucial to monitor air quality.
The Air Quality Index, or AQI, is used to gauge air quality. Similar to a thermometer with a range of 0 to 500 degrees, the AQI measures air quality. But the air quality index is a technique of displaying variations in the quantity of pollution in the air, not changes in temperature.
The degree of air pollution and the resulting health risk increase with increasing air quality index values. As an illustration, an air quality index score of 50 or less indicates healthy air quality, whereas one of over 300 indicates dangerous air quality.
Governmental organizations employ air quality indices to inform the general public of how filthy the air is now or is expected to become.
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