Get 40 Cfr Parts 53 And 58 - Epa

Title 40, Code of Federal Regulations (40 CFR) Title 40: Protection of Environment is the section of the CFR that deals with EPA's mission of protecting human health and the environment. The CFR is available from the Government Printing Office .

EPA has set both an annual and a 24-hour standard for PM2. 5. These standards work together to protect public health from harmful health effects from both long- and short- term fine particle exposures.

eCFR :: 40 CFR Part 50 -- National Primary and Secondary Ambient Air Quality Standards.

Currently, EPA has primary and secondary standards for PM2.5 (annual average standards with levels of 12.0 µg/m3 and 15.0 µg/m3, respectively; 24-hour standards with 98th percentile forms and levels of 35 µg/m3) and PM10 (24-hour standards with one-expected exceedance forms and levels of 150 µg/m3).

The updated recommended guideline levels for the other key pollutants are: PM10 (particulate matter with a diameter of 10 microns or less) concentrations of 15 µg/m3 annual mean, 45 µg/m3 24-hour mean. Ozone (O3) concentrations of 100 µg/m3 8-hour mean.

The Agency is proposing to retain the primary 24-hour PM2.5 standard of 35 micrograms per cubic meter, while taking comment on revising this level to as low as 25 micrograms per cubic meter.

Currently, EPA has primary and secondary standards for PM2.5 (annual average standards with levels of 12.0 µg/m3 and 15.0 µg/m3, respectively; 24-hour standards with 98th percentile forms and levels of 35 µg/m3) and PM10 (24-hour standards with one-expected exceedance forms and levels of 150 µg/m3).

National Ambient Air Standards are established to be protective of public health. The short-term standard (24-hour or daily average) is 35 micrograms per cubic meter of air (µg/m3) and the long-term standard (annual average) is 12 µg/m3.