Question

the quality of the air is decreasing because of increased level of
​

Answer 1

Answer:

Particulate matter and other pollution have dramatically decreased over the past 40 years, in large part because of regulations put in place under the Clean Air Act of 1970 and its later updates, experts say

Answer 2

Answer:

smog is your answer

hope it helps

plz follow me and mark it a BRAINLIEST ANSWER