Keep in mind that the AirNow method for calculating AQI colors is based on unvalidated hourly data. The reported colors are based on a custom mathematical algorithm (called NowCast) that relates those hourly values to the 24 hour AQI scale. This algorithm can produce different results (AQI colors) than those reported in the more detailed smoke impact summaries, which simply report 3 and 24 hr averages against AQI colors based on breakpoints set forth in the Wildfire Smoke, A Guide for Public Health Officials, a document published by California Air Resources Board in 2012.
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