WASHINGTON, Dec. 5 (TNSFR) -- The U.S. Environmental Protection Agency has taken final action to approve several revisions to the regional haze state implementation plans (SIPs) submitted by Oklahoma and Texas, concluding a multi-year effort to satisfy federal requirements for improving visibility in U.S. national parks.

The agency approved revisions submitted by the Texas Commission on Environmental Quality (TCEQ) on March 20, 2014, and July 20, 2021. The TCEQ's plans address . . .

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