Air Quality Index

1. A measure of the quantity of harmful particles and chemicals in the air.

The index is used by weather forecasters to indicate the purity of the air on a given day. The higher the index, the smoggier (see smog) and more polluted the air.

Example Sentences

The scale however does not go beyond 500 - a cap set more than a decade ago when the National Air Quality Index was launched.

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"National Air Quality index will need to be revised if we want to include the sensor-based data," says Mr Pathak.

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It uses the government's Daily Air Quality Index to determine when alerts are triggered.

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“Windblown ash particles may be too large to be detected by air quality instrumentation and will not influence Air Quality Index levels,” the advisory stated.

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Even though windblown ash particles may be too large to be detected by air quality instrumentation and officials warn it will not influence Air Quality Index levels, you should still keep an eye on the air quality in your area.

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