Under the Clean Air Act, the Environmental Protection Agency (EPA) sets limits on how much of a pollutant is allowed in the air anywhere in the United States. Although national air quality has improved over the last 20 years, many challenges remain in protecting public health and the environment. EPA's goal is to have clean air to breathe for this generation and those to follow.

Although the Nation’s air quality has improved significantly between 1970 and 1996, continued improvement has been called for to protect public health.

While a significant portion of the funding goes directly to states to administer their programs, a small portion also goes to tribes in each EPA region. The EPA Region 8, the Rocky Mountain Region, is home to 27 tribes, and most have developed the Tribal Air Monitoring Program with their own air pollution priorities and goals under the Clean Air Act.


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