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Definition of air quality index noun from the Oxford Advanced Learner's Dictionary

air quality index

noun
 
/ˈeə kwɒləti ɪndeks/
 
/ˈer kwɑːləti ɪndeks/
(abbreviation AQI)
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  1. a measure of how polluted the air is
    • The city's overall air quality index is among the lowest in the country.
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ripple effect
noun
 
 
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Change, cause and effect
C2
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