What must be utilized in areas with Prevention of Significant Deterioration (PSD) under the Clean Air Act?

In areas designated under the Prevention of Significant Deterioration (PSD) program, the requirement to utilize Best Available Control Technology (BACT) is a key aspect of the Clean Air Act. BACT refers to the maximum degree of pollutant control that can be achieved, taking into account economic and technical feasibility. This requirement ensures that new and modified major stationary sources in these areas implement the best technology available to minimize emissions of pollutants, thus protecting air quality and promoting environmental sustainability.

This approach is essential because PSD areas are often in regions with pristine air quality, and the regulations seek to maintain that standard by imposing stringent controls on new industrial developments. By utilizing BACT, industries are encouraged to adopt cleaner and more efficient technologies that can significantly reduce emissions compared to existing methods.

The other options do not align with the regulatory framework established by the Clean Air Act for PSD areas. For example, Efficient Emission Systems, Prohibited Emission Services, and Advanced Pollution Controls are not terms that are specifically recognized or utilized within the context of the PSD requirements. Thus, BACT remains the correct and relevant answer in this context.