CASAC Backs Trump-Era Ozone Science But Opens Door To Stricter Limits

October 26, 2022
EPA’s clean air science advisers are broadly backing Trump-era science as adequate for reconsideration of federal ozone limits, but are calling for less emphasis on human-exposure studies, full consideration of data impacted by wildfire smoke, and a first-time distinct “secondary” ozone limit -- changes that could favor tougher limits. In an Oct. 25 draft letter to Administrator Michael Regan, the Clean Air Scientific Advisory Committee (CASAC) says that a 2020 integrated science assessment (ISA), performed by EPA to support the...

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