Answer:

Experience with the Clean Air Act since 1970 has shown that protecting public health and building the economy can go hand in hand.

Clean Air Act programs have lowered levels of six common pollutants -- particles, ozone, lead, carbon monoxide, nitrogen dioxide and sulfur dioxide -- as well as numerous toxic pollutants.

Between 1970 and 2020, the combined emissions of the six common pollutants (PM2.5 and PM10, SO2, NOx, VOCs, CO and Pb) dropped by 78 percent. This progress occurred while U.S. economic indicators remain strong.

The emissions reductions have led to dramatic improvements in the quality of the air that we breathe. Between 1990 and 2020, national concentrations of air pollutants improved 73 percent for carbon monoxide, 86 percent for lead (from 2010), 61 percent for annual nitrogen dioxide, 25 percent for ozone, 26 percent for 24-hour coarse particle concentrations, 41 percent for annual fine particles (from 2000), and 91 percent for sulfur dioxide. (For more trends information, see EPA's Air Trends site.)

These air quality improvements have enabled many areas of the country to meet national air quality standards set to protect public health and the environment. For example, all of the 41 areas that had unhealthy levels of carbon monoxide in 1991 now have levels that meet the health-based national air quality standard. A key reason is that the motor vehicle fleet is much cleaner because of Clean Air Act emissions standards for new motor vehicles.

Airborne lead pollution, a widespread health concern before EPA phased out lead in motor vehicle gasoline under Clean Air Act authority, now meets national air quality standards in most areas of the country.

State emission control measures to implement the Act, as well as EPA's national emissions standards, have contributed to air quality improvements.

Explanation:

Answer:

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Explanation:

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