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What has caused air quality in United States to improve/get better since the 1950s?
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What has caused air quality in United States to improve/get better since the 1950s?

User Virani Vivek
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5 votes

Answer:

Reducing pollution from transportation sources has led to healthier air for Americans. In cities, smog has been visibly reduced.

Step-by-step explanation:

i hope this helped

User Dribbler
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3 votes

Answer:

better mileage on cars, took lead out of paint, smaller packaging like for delivery and store products, EPA laws updating

User Adeniyi
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