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AQI — 1 pages

Reference The US AQI Is Not a Concentration: 100 Marks the Standard, and Ozone Runs on an 8-Hour Clock The US AQI covers five pollutants in six colour categories. An AQI of 100 generally equals the short-term national standard, not a concentration. Ozone is an 8-hour index, particles 24-hour. Science · Sep 23