Question

| WILL MARK AS BRAINLIST | What has caused air quality in the United States to improve / get better since the 1950's?

More cars on the road
More industrial production
Pollution control devices
More favorable weather patterns

Answer 1

Answer:

Starting from the 1950s, both robberies and air pollution has increased and the conclusion that we can say regarding this increase is NOT JUSTIFIABLE. It is not justifiable because population is a different variable and they are not directly related to each other. Hope this helps.

Hope it's what your looking for

Answer 2

Answer:

Reforestation or forest reserves.

Explanation:

Trees absorb the carbon from the exhaust of the engines and give oxygen in return