The 1970 Clean Air Act and subsequent environmental regulations have resulted in
A)reductions in lead by about 89%.
B)reductions in carbon monoxide by about 10%.
C)surprising increases in sulfur dioxide levels by about 5%.
D)surprising increases in radon levels by about 20%.

Question

Quizplus · Accepted Answer

The 1970 Clean Air Act and subsequent environmental regulations have been successful in reducing lead levels by about 89%. This is because the act included regulations on lead emissions from sources like gasoline, which has resulted in significant improvements in air quality.

The 1970 Clean Air Act and Subsequent Environmental Regulations Have