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US air quality
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Reference
The US AQI Is Not a Concentration: 100 Generally Corresponds to the Short-Term Standard, and the Daily Ozone AQI Runs on an 8-Hour Clock
The US AQI covers five pollutants in six colour categories. An AQI of 100 generally corresponds to the short-term national standard. Daily ozone AQI is 8-hour, particles 24-hour; NowCast differs.
Science · Oct 6
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