دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (BACT) an air emission standard of technology determined by the states on a case-by-case basis. The BACT is applied in attainment areas that meet or exceed NAAQS. and states can consider cost and economic impact when determining exactly what the BACT is and how it will be applied in a specific case.

n pi: those air pollutants that fall under NAAQS: particulates, ozone, carbon monoxide, nitrogen dioxide, lead, and sulphur dioxide. Sometimes called criteria pollutants.

n pi: the six air pollutants listed under NAAQS in the CAA: ozone, carbon monoxide, sulfur dioxide,lead. nitrogen dioxide, and particulate matter. Sometimes called conventional pollutants.

n: (LAER) an air emission standard determined by the states on a case-by-case basis. LAER is applied in nonattainment areas, which do not meet NAAQS, and is more stringent than the BACT applied in attainment areas. Consequently, cost and economic impact are not taken into consideration in determining LAER.

abbr: National Ambient Air Quality Standards.

n pi: (NAAQS) standards listed under the CAA for six major, or criteria, pollutants: ozone, carbon monoxide, sulphur dioxide, lead, nitrogen dioxide, and particulate matter. Areas that exceed the recommended levels for these pollutants are nonattainment areas, or areas with poor air quality;areas that meet or fall below the NAAQS levels are attainment areas, or areas with good air quality.

n: (NSPS) CAA standards that set forth allowable emissions for new major pollution sources and major modifications to existing sources. NSPS can extend to pollutants not included in NAAQS and NESHAP and may include VOCs and hydrogen sulphide.

n pl: areas in the United States that fail to meet NAAQS and that are subject to tighter emission controls and more complicated requirements than are attainment areas. Major new or modified air pollution sources in nonattainment areas must get a permit to build, offset the new emission increase by obtaining reducions from existing sources, and must meet the lowest achievable emission rate.

n: (PSD) a provision under the CAA that prevents deterioration of air quality in areas where the air is already better than NAAQS. Under PSD, major new emission sources must demonstrate that they will not degrade air quality any more than the NAAQS allow in that particular area. Ma- jor air emitters in attainment areas must obtain PSD permits and install the best- available control technology.