This simply misses the point. Very few laws are restricted to the best science of their day: nearly all allow for administrative interpretation so that the US Government can apply the law without having to relitigate its essential qualities.
The CAA empowers the EPA to identify pollutants, and that's what the EPA has (correctly!) done. Whether or not the scientific consensus from the 1960s agrees is immaterial.
The CAA empowers the EPA to identify pollutants, and that's what the EPA has (correctly!) done. Whether or not the scientific consensus from the 1960s agrees is immaterial.