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How is the air quality measure (number of days exceeding the daily PM2.5 NAAQS) calculated?

April 26, 2017air quality calculated days exceeding measure naaqs pm2.5

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How is the air quality measure (number of days exceeding the daily PM2.5 NAAQS) calculated?

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The air quality measure is the number of days that the maximum PM2.5 daily concentrations exceed the NAAQS. The maximum PM2.5 daily concentration is determined by retaining the maximum concentration reported for each monitoring site for each monitored day. The values that exceed the NAAQS of 35 ug/m3 (i.e., 35.5 and higher) are considered above the NAAQS.