Wyoming must clean up its air, but not as much as US environmental regulators wanted
What happened
US environmental regulators partially approved and partially rejected Wyoming's plan to reduce regional haze. This means Wyoming must take some steps to improve air quality, but it avoids the stricter requirements the regulators initially proposed.
Why it matters
The Clean Air Act requires states to improve air quality in national parks and wilderness areas. Wyoming's plan was supposed to address this, but US environmental regulators found it did not go far enough. This partial rejection means Wyoming will have to do more than it planned, but less than the regulators demanded.
The signal
Watch for Wyoming's revised plan and whether it includes new controls on specific industrial sources, or if the state challenges the US environmental regulators' decision in court.