air quality index used government agencies communicate the public how polluted text concept button keyboard |
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navigate by keyword : button keyboard advice air aqi background concentration definition design dose effects environmental episode forecast health help high impact index indices local period pollutant pollution poor quality quote risk scale standards states text today tomorrow tonight understand united weather word used government agencies communicate public polluted concept |
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Air Quality Index - used by government agencies to communicate to the public how polluted the air, text concept button on keyboard. |
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