Missoula can now pump gas without added oxygen, even if air quality drops

US environmental regulators are letting Missoula, Montana, remove a rule that required special oxygenated gasoline. This means gas stations in Missoula no longer have to sell a specific fuel blend designed to reduce carbon monoxide.

For years, Missoula had to use a special gasoline blend to keep its air clean. Now, the city can stop requiring this fuel, even if carbon monoxide levels rise again. The rule about oxygenated fuel will only kick in if air quality gets bad enough to trigger an emergency plan.