Environmental Concerns 637 Prevention of Significant Deterioration Program(PSD). PSD review is required if the new source or modifications result in a net emission increase above specified levels he specific pollutants referred to include carbon monoxide, nitrogen dioxide, lead, ozone, inhalable particulates, and sulfur dioxide Primary and secondary standards also were set by EPA, with second ary standards reflecting levels necessary to protect welfare in addition to health An area may be in an attainment status for one pollutant and in a non- attainment status for another pollutant. In most areas, PSD authority has been assigned to either the state or local jurisdiction. The use of the best Available Control Technology(BACT) is required for each pollutant and is based on the emission level and capital and operating costs. Regulations in on-attainment areas are required to meet the EPa s New Source review (NSR) regulations The Clean Air Act of 1990 included a list of 189 toxic chemicals to be controlled and such emissions are to be reduced 90% by the year 2000. It also included the phasing out of chlorinated fluorocarbons( CFC's)and carbon tetrachloroflurocarbons(HCFC s)by 2030 All new and modified emission sources must meet the New Source Performance Standards(NSPS). These standards are generally less strin gent than either the Best Available Control Technology(BAct) or the Lowest Available Emission Rate(LaeR) The National Emission Standards for Hazardous Air Pollutants (NESHAPS) specify emission standards for various hazardous air pollut ants and cover asbestos, arsenic, benzene, beryllium, mercury, vinyl chlo- ride. Pvc. etc The CAaa was promulgated to strengthen the federal air protection program and concerns about air toxics by including an expanded National Emission Standards for Hazardous Air Pollutants(NESHAP) program Concerns over the effects of hazardous air pollutants(HAP)or air toxics resulted in the Title Operating permit program. The relationship ofthe Title V program to other CAa titles is shown in FigEnvironmental Concerns 637 Prevention of Significant Deterioration Program (PSD). PSD review is required if the new source or modifications result in a net emission increase above specified levels. The specific pollutants referred to include carbon monoxide, nitrogen dioxide, lead, ozone, inhalable particulates, and sulfur dioxide. Primary and secondary standards also were set by EPA, with second￾ary standards reflecting levels necessary to protect welfare in addition to health. An area may be in an attainment status for one pollutant and in a non￾attainment status for another pollutant. In most areas, PSD authority has been assigned to either the state or local jurisdiction. The use of the Best Available Control Technology (BACT) is required for each pollutant and is based on the emission level and capital and operating costs. Regulations in non-attainment areas are required to meet the EPA’s New Source Review (NSR) regulations. The Clean Air Act of 1990 included a list of 189 toxic chemicals to be controlled and such emissions are to be reduced 90% by theyear 2000. It also included the phasing out of chlorinated fluorocarbons (CFC’s) and carbon tetrachloroflurocarbons (HCFC’s) by 2030. All new and modified emission sources must meet the New Source Performance Standards (NSPS). These standards are generally less strin￾gent than either the Best Available Control Technology (BACT) or the Lowest Available Emission Rate (LAER). The National Emission Standards for Hazardous Air Pollutants (NESHAPS) specie emission standards for various hazardous air pollut￾ants and cover asbestos, arsenic, benzene, beryllium, mercury, vinyl chlo￾ride, PVC, etc. The CAAA was promulgated to strengthen the federal air protection program and concerns about air toxics by including an expanded National Emission Standards for Hazardous Air Pollutants (NESHAP) program. Concerns over the effects of hazardous air pollutants (HAP) or air toxics resulted in the Title Voperating permit program. The relationship ofthe Title V program to other CA4 titles is shown in Fig. 1