That’s not how laws work, especially the Clean Air Act. “There are no solutions. There are only tradeoffs.” (https://ozgengungor.medium.com/one-of-those-quotes-thomas-so...).
The Clean Air Act was not designed to achieve cleaner air at any cost, but instead to achieve targeted pollution control that would have the greatest value at acceptable cost. The modern structure of the act was set in place in 1970 under Nixon, and is full of legislative compromises to balance incremental benefits to air quality against burden on industry.