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

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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The air quality index in Delhi was above 400 in several areas, according to the state-run Safar website.

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Lahore and its 13 million residents have now been choking for a week; the air quality index has passed the 1,000 mark repeatedly this month - anything above 300 is considered hazardous.

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