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EPA Proposes Tightened Ozone Standards: Where Are We Now?

As the ozone season hits its peak here in Philadelphia, the Environmental Protection Agency has proposed to tighten the National Ambient Air Quality Standards (NAAQS) for ground-level ozone, commonly known as "smog." If this sounds familiar, it is. The EPA's last revision of the ozone NAAQS in 1997 set off a firestorm of legal challenges and a series of federal and state regulatory actions that continue to date.

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