دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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.

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 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.