Biology, 11.11.2019 10:31, joshbee2014

(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

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(14 points) what nationwide step that greatly reduced dangerous automobile emissions was mandated by...