Question

(14 points) What nationwide step that greatly reduced dangerous automobile emissions was mandated by the U.S. Clean Air Act?

a switch from gasoline-powered cars to hybrid gasoline-electric cars

a raising of the heights of factory chimneys that polluted

the gradual elimination of leaded gasoline as an auto fuel

a change from American cars to cars from other auto-producing nations

Answer 1

Answer: the gradual elimination of leaded gasoline as an auto fuel

Step-by-step explanation:

I just took the test

Answer 2

the gradual elimination of leaded gasoline as an auto fuel