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At least 100 national and state parks might not be in compliance with the Environmental Protection Agency’s stricter ozone rule, according to a new report by the conservative American Action Forum.

Not only is the EPA’s new ozone rule possibly the most expensive regulation ever proposed, it is so strict that not even national and state parks will be able to be in compliance, according to AAF’s report.

“Hardly transportation corridors and centers of heavy pollution, many observers would be surprised to know that Death Valley National Park, Sequoia National Park, and Cape Cod National Seashore have ozone readings of 71 to 87 [parts per billion],” AAF policy experts Sam Batkins and Catrina Rorke write in their report.