The Act does not preclude a state from adopting an implementation plan which will exceed national ambient standards, i.e., will produce ambient air even cleaner than that mandated by NAAQSs.

• 这一法案并不排除州采用一个超过国家环境标准的计划，例如，一个比《全国环境空气质量标准》所规定的更好的环境空气执行计划。