WASHINGTON, June 2 (TNSFR) -- The U.S. Environmental Protection Agency has partially approved Hawaii's regional haze State Implementation Plan revision for the second implementation period under the Clean Air Act, concluding that portions of the state's long-term strategy do not meet federal requirements. The final rule, effective June 29, 2026, addresses Hawaii's efforts to reduce visibility impairment in mandatory Class I federal areas while evaluating measures intended to advan . . .

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