States, Industry Warn Of Implementation Concerns With Tougher PM NAAQS

States and industry groups that otherwise differ over EPA’s plan to tighten fine particulate matter (PM2.5) standards are agreeing on the need for the agency to ease serious implementation challenges that would accompany tighter limits, especially over issues like wildfires that are most pronounced in California and other Western states. EPA’s plan to reconsider and tighten its national ambient air quality standards (NAAQS) is supported by some states and environmental groups, who urge the agency to set even stricter limits...