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Definition of AQI noun from the Oxford Advanced Learner's Dictionary

AQI

noun
 
/ˌeɪ kjuː ˈaɪ/
 
/ˌeɪ kjuː ˈaɪ/
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  1. a measure of how polluted the air is (the abbreviation for
    air quality index
    )
    • The average 24-hour AQI was 370 on Wednesday.

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