Weekly Focus

Distinct Secondary NAAQS Would Take Air Act Into ‘Uncharted’ Terrain

September 22, 2022
EPA advisers and environmentalists are once again urging the agency to set a first-time unique “secondary” ozone standard distinct from the primary health-based limit, raising questions for the agency, states and industry over how to enforce such a limit that one state regulatory expert says would take the Clean Air Act into “uncharted territory.” EPA has never set a secondary national ambient air quality standard (NAAQS) -- which protect the environment -- using a different “form,” “indicator” and stringency than...

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