Currently, the Clean Air Act requires all vehicles sold in the U.S. to have technology that captures toxic gases and soot before they leave the tailpipe. This bill would effectively end those rules, representing one of the biggest changes to environmental law in decades. While it would make trucks simpler and cheaper to operate, it would also lead to a massive increase in smog and greenhouse gas emissions across the country.

If this becomes law, the EPA would lose its power to police 'delete kits' and other modifications that people use to make their trucks louder or more powerful at the expense of air quality. It would also fundamentally change the justice system for environmental crimes by erasing past convictions and sentences for these specific offenses.