How did the Clean Air Act affect the American automotive industry in the 1970s?

1. It forced every American automaker to stop making cars and switch entirely to producing trains
2. It provided direct federal government subsidies for every single new car sold in the country
3. It banned the use of rubber tires and leaded gasoline on all newly manufactured vehicles nationwide by federal law
4. It required a 90% reduction in tailpipe emissions, leading to the development of the catalytic converter

Practice all 20 The EPA and Clean Air Act questions