Despite blunt internal criticism by its own staff experts, the Environmental Protection Agency (EPA) is proceeding with a plan to revise regulations under the Clean Air Act that currently safeguard areas with some of the nation's cleanest air.

The proposed changes would effectively hide pollution spikes from regulators, ignore existing major polluters, allow "phony pollution accounting" methods, and let states establish their own standards, says Mark Wenzler, clean air director of the National Parks Conservation Association, a Washington-based advocacy group.

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