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The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards (40 CFR part 50) for pollutants considered harmful to public health and the environment. The Clean Air Act identifies two types of national ambient air quality standards. Primary standards provide public health protection, including protecting the health of “sensitive” populations such as asthmatics, children, and the elderly. Secondary standards provide public welfare protection, including protection against decreased visibility and damage to animals, crops, vegetation, and buildings.

–“National Ambient Air Quality Standards (NAAQS),”
Environmental Protection Agency

Primary air quality standards are designed to protect the health of
.

People with asthma can expect clean air under the
standards in the Clean Air Act.


air quality standards provide protection of public welfare.


are covered under the act’s secondary air quality standards.