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The Air Quality Index (AQI) can tell you a lot about the health of the environment, ... “For PM2.5 specifically, it considers a 24-hour average. Thus, during a scenario like a major, short-lived ...
An individual score (Individual Air Quality Index, IAQI) is calculated using breakpoint concentrations below, and using same piecewise linear function to calculate intermediate values as the US AQI scale. and The final AQI value can be calculated either per hour or per 24 hours and is the max of these six scores.
The PM NowCast is used in lieu of a 24-hour average PM concentration in the calculation of the AQI until an entire calendar day of hourly concentrations has been monitored. The Ozone NowCast is an algorithm [1] developed by the USEPA to predict the 8-hour ozone average centered on the current hour from the current 1-hr average ozone data. At ...
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: ...
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 ...
Here's how to understand the EPA's Air Quality Index and what to do when pollution levels become a health concern. ... 24/7 Help. For premium support please call: 800-290-4726 more ways to reach ...
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.
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]