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PM 2.5 AQI of US monitors, calculated utilizing NowCast, courtesy US EPA PM2.5 AQI map, calculated utilizing NowCast, courtesy US EPA. The PM (particulate matter) NowCast is a weighted average of hourly air monitoring data used by the United States Environmental Protection Agency (USEPA) for real-time reporting of the Air Quality Index (AQI) for PM (PM 10 - particles less than 10 micrometers ...
The index is based on the concentrations of five pollutants. The index is calculated from the concentrations of the following pollutants: ozone, nitrogen dioxide, sulfur ioxide, PM2.5 and PM10. The breakpoints between index values are defined for each pollutant separately and the overall index is defined as the maximum value of the index.
The EPA uses a formula to calculate AQI values — it doesn't simply add up the impact of each pollutant. The AQI uses a scale that typically ranges from zero to 500 to denote air quality.
ADMS-5 – See the description of this model in the alternative models section of the models accepted by the U.S. EPA. ADMS-URBAN – A model for simulating dispersion on scales ranging from a street scale to citywide or county-wide scale, handling most relevant emission sources such as traffic, industrial, commercial, and domestic sources.
eGRID2016 was released by EPA on February 15, 2018. It contains year 2016 data. eGRID2014 was released by EPA on January 13, 2017. It contains year 2014 data. eGRID2012 was released by EPA on October 8, 2015. It is the 10th edition and contains year 2012 data. eGRID2010 Version 1.0 with year 2010 data was released on February 24, 2014.
In 2006, the EPA conducted air quality designations in all 50 states, denoting areas of high pollution based on criteria such as air quality monitoring data, recommendations submitted by the states, and other technical information; and reduced the National Ambient Air Quality Standard for daily exposure to particulates in the 2.5 micrometers ...
Based on this report (1977 Lead AQCD), the EPA established a "1.5 μg/m 3 (maximum quarterly calendar average) Pb NAAQS in 1978." [9] The Clean Air Act requires periodic review of NAAQS, and new scientific data published after 1977 made it necessary to revise the standards previously established in the 1977 Lead AQCD document. An Addendum to ...
Since 1999, the EPA has used the air quality index (AQI) to communicate air pollution risk to the public, on a scale from 0 to 500, with six levels from Good to Hazardous. [10] (The previous version was the Pollutant Standards Index (PSI), which did not incorporate PM2.5 and ozone standards.)