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The Air Quality Index ... 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. ... “For PM2.5 specifically, it considers a 24-hour average. Thus, during a scenario ...
An air quality index (AQI) ... Each range is assigned a descriptor, a color code, and a standardized public health advisory. ... Because the benchmark is a 24-hour ...
After the day is over and all of the hourly data is available, the AQI for the day is calculated from the 24-hr average; 144/24 μg/m 3 = 6.0 μg/m 3, an AQI of 33 (Color Code Green, Air Quality: Good). EPA has developed a calculator to compute the PM NowCast, AQI, and AQI category and color from the most recent 12 hours of monitoring data.
Once the index reaches 301, the AQI will be at a code maroon. That means the air quality is hazardous and constitutes a “health warning of emergency conditions” as everyone is more likely to ...
The index and the air quality objectives were set in 1987; and pollutant levels are measured over varying periods, in μg/m 3. There are hourly, 24-hour and annual targets for sulfur dioxide and nitrogen dioxide, and 24-hour and annual targets for particulates.
And the subsequent Air Quality Index (AQI) measures the amount of pollution in the air on a 0-500 scale, with the higher number signaling a higher concentration of the following pollutants ...
24-hour Not to be exceeded more than once per year on average over 3 years 40 CFR 50.6: Fine particulate matter (PM 2.5) Primary 9.0 μg/m 3 (12 μg/m 3 prior to May 6, 2024) [25] annual Annual mean, averaged over 3 years 40 CFR 50.18: Secondary 15 μg/m 3: annual Annual mean, averaged over 3 years 40 CFR 50.7: Primary and Secondary 35 μg/m 3: ...
The reports provide guidelines intending to give guidelines to reduce the health effects of air pollution. [2] The guidelines stipulate that PM 2.5 should not exceed 5 μg/m 3 annual mean, or 15 μg/m 3 24-hour mean; and that PM 10 should not exceed 15 μg/m 3 annual mean, or 45 μg/m 3 24-hour mean. [2]