Montana must now use the newest air quality models to check for ozone pollution
What happened
US environmental regulators approved Montana's plan to meet federal air quality standards. This means Montana must now use the most recent computer models to predict air pollution levels.
Why it matters
Every state must show it can meet federal air quality standards. This approval means Montana's plan is now up to date with the latest scientific tools. It ensures that the state's air quality checks are based on the best available data, making it harder to underestimate pollution.
The signal
Watch for other states to update their air quality plans with these same modeling guidelines, especially those struggling to meet ozone standards.