What was the major improvement to air quality contributed by the 1990 amendments to the Clean Air Act? A. The amendments required a significant reduction in 189 toxic chemicals.
B. The amendments required significant reductions in the original 7 toxic chemicals listed.
C. The amendments required “superclean” or zero emission vehicles.
D. The amendments required a significant decrease in indoor air pollutants.
The correct answer is: A. The amendments required a significant reduction in 189 toxic chemicals.
The 1990 amendments to the Clean Air Act significantly expanded the list of toxic air pollutants and set standards for reducing emissions of these pollutants. This included 189 additional chemicals, which aimed to improve air quality and protect public health from harmful airborne toxins. If you have more questions or need further assistance, feel free to ask!