“The Baton Rouge area has never met the [Clean Air Act’s] minimum health protection standard for ozone pollution,” Louisiana Environmental Action Network, or LEAN, said in a letter to those agencies.

Officials of the U.S. Environmental Protection Agency in Washington, D.C., and Dallas declined to comment on the letter.

“It’s a notice of intent to sue,” said Dave Bary, a spokesman for EPA’s regional office in Dallas. “I’m not in a position to comment at this time.”

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