Standards secondary ambient air quality

TABLE 25-1 National Primary and Secondary Ambient Air Quality Standards... 

United States National Primary and Secondary Ambient Air Quality Standard, attained when the expected number of days per calendar year with maximum hourly average concentrations above 0.12 ppm is equal to or less than 1, as determined in a specified manner... 

Notes National primary ambient air quality standards define levels of air quality which the EPA Administrator judges are necessary, with an adequate margin of safety, to protect the public health. National secondary ambient air quality standards define levels of air quality, which the Administrator judges necessary to protect the public welfare from any known or anticipated adverse effects of a pollutant. 

U.S. Environmental Protection Agency. Part 410—National primary and secondary ambient air quality standards. Federal Roister 36 8186-8201, 1971. 

EPA Primary and secondary ambient air quality standards 0.053 ppm, annual arithmetic mean concentration EPA 1993... 

National primary and secondary ambient air quality standards... 

The Clean Air Act of 1967, amended in 1970, called upon the Administrator of the Environmental Protection Agency (EPA) to promulgate national primary and secondary ambient air quality standards for each air pollutant for which air quality criteria have been issued (2). A national primary ambient air quality standard is the maximum ground level pollutant concentration which in the judgment of the Administrator of EPA can be tolerated to protect the public health, based on the published air quality criteria. A national secondary ambient air quality standard is a more stringent concentration level which in the. judgment of the Administrator is required to protect the public welfare from any known or anticipated adverse effect associated with the presence of the air pollutant in the ambient air. The criteria for an air pollutant, to the extent that is practical, shall include those variable factors which may alter the effects on public health or welfare by the air pollutant and any known or anticipated adverse effects on welfare. 

A power plant is burning anthracite coal containing 7.1% ash to provide the necessary energy for steam generation. If 300 of total flue gas are produced for every pound of coal burned, what is the maximum effluent particulate loading in gr/ft Assume no contribution to the particulates from the waste. The secondary ambient air quality standard for particulates is 75 pg/m. What dilution factor and particulate collection efficiency are required to achieve this standard ... 

The primary and secondary ambient air quality standards for nitrogen oxides are somewhat higher than for sulfur dioxide because the needs for control measures are driven by very similar requirements, namely, health effects and their influence on the pH of precipitation (Table 3.7). The significant role of nitrogen oxides (NOx) in the chemistry of photochemical smog episodes is a further factor used to determine ambient air quality standards. 

The Administrator shall...approve...[a SIP]...if he determines that it was adopted after reasonable notice and hearing and that...(E) it contains adequate provisions (i) prohibiting any stationary source within the State from emitting any air pollutant in amounts which will (I) prevent attainment or maintenance by any other State of any such national primary or secondary ambient air quality standard, or (II) interfere with measures required to be included in the applicable implementation plan for any other State under Part C to prevent significant deterioration of air quality or to protect visibility, and (ii) insuring compliance with the requirements of Section 126, relating to interstate pollution abatement ... 

U.S. Envirorunental Protection Agency, 1978. National Primary and Secondary Ambient Air Quality Standards for Lead. 43 FR 46246-46263, October 5, 1978. 

U.S. EPA, 2012. 40 CFR 50.11—national primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator). Retrieved from http // www.gpo.gOv/fdsys/pkg/CFR-2012-title40-vol2/pdf/CFR-2012-title40-vol2-sec50-ll.pdf (accessed 21.11.12). 

National primary and secondary ambient air quality standards for lead. 1987. 40 CFR 50.12 (latest amendment 52 FR 31701)... 

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