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Good - Air quality is considered to be satisfactory, and air pollution poses little or no risk.
Moderate - Air quality is acceptable; however, for some pollutants there may be moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for Sensitive Groups (USG) - Increased likelihood of respiratory symptoms in sensitive individuals, aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly.
Unhealthy - Increased aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; increased respiratory effects in the general population.
Very Unealthy - Significant aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; significant increase in respiratory effects in the general population.
Hazardous - Significant aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; signifigant increase in respiratory effects in the general population.

What is PM?

The Great Basin Unified Air Pollution Control District is a California regional government agency that works to protect the people and the environment of Alpine, Mono and Inyo Counties from the harmful effects of air pollution.

Inyo, Mono and Alpine Counties joined together in 1974 in a joint powers agreement to form the Great Basin Unified Air Pollution Control District, which covers the Great Basin Valleys - Air Basin in California.

GBUAPCD's purpose is to enforce federal, state and local air quality regulations and to ensure that the federal and state air quality standards are met in the District. These standards are set to protect the health of sensitive individuals by restricting how much pollution is allowed in the air.

To meet these standards GBUAPCD enforces those federal laws delegated to us, state laws on stationary sources of pollution, and pass and enforce our own regulations as they become necessary.