Enactment of the clean air act

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Reference no: EM13181288

Which of the following describes changes in the 5 criteria air pollution in the US since the enactment of the clean air act?

a emissions have decreased but ambient air quality remains the same.

b they have decreased substantially.

c they are about the same.

d they have increased because of economic growth and more automobiles.

e they have become steadily worse.

Reference no: EM13181288

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