Air Quality Index
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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
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
On Wednesday, we had a rare afternoon where the Air Quality Index was below 100.
From Slate • Feb. 12, 2026
For those who wish to view the Air Quality Index forecast, or for real-time air quality updates, visit AQMD.gov.
From Los Angeles Times • Jan. 17, 2024
Over the past few days, Lahore's Air Quality Index - which measures the level of fine particulate matter in the air - have hovered around the 400 mark.
From BBC • Nov. 10, 2023
The Michigan Department of Health and Human Services advised people in the state to check the Air Quality Index regularly to decide if they should be participating in outdoor activities.
From Seattle Times • Jul. 16, 2023
In Los Angeles, meteorologists warned that the Air Quality Index could reach hazardous levels from the evening of July 4 into the morning of July 5, but then decrease throughout the day on Wednesday.
From New York Times • Jul. 5, 2023
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
