Text: The Clean Air Act Amendments (CAAA) Section 812 Prospective Study of Costs and Benefits (1999): Advisory by the Health and Ecological Effects Subcommittee on Initial Assessments of Health and Ecological  Part 1. July.
Entailment: The Clean Air Act Amendments work to avoid pollution in a cost effective manner.
Contradiction: There are no amendments which have been put in place to make the air cleaner.