CURRENT AIR QUALITY

Current Air Quality Information can be found at the links below. Some Air Districts also provide air quality information: click an air district link on the right.
Air Quality Index (AQI) Descriptions
The Air Quality Index (AQI) Colors are consistent, the numbers used may be either the Air Quality Index numbers or the actual PM 2.5 or ozone concentration numbers dependent on the website air quality information used.

Category
Meaning
Actions to Protect Yourself
Good
Air quality is satisfactory and poses little or no health risk.
None.

Moderate
Air Quality is acceptable for most. There may be moderate health concern for a small number of sensitive people.
Unusually Sensitive people should consider reducing prolonged or heavy outdoor recreation.
Unhealthy for Sensitive Groups(USG)
Increasing likelihood of respiratory symptoms in sensitive individuals, aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly.
People with heart or lung disease, children and older adults should avoid all physical outdoor activity. 
Unhealthy
Increasing aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; increased respiratory effects in general population.
People with heart or lung disease, older adults, and children should avoid prolonged or heavy exertion. Everyone else should reduce prolonged or heavy exertion.
Very Unhealthy
Increasing aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; increased respiratory effects in general population.
People with heart or lung disease, older adults, and children should avoid prolonged or heavy exertion. Everyone else should reduce prolonged or heavy exertion.
Hazardous
Significant aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; significant increase in respiratory effects in general population.
People with heart or lung disease, older adults, and children should avoid all physical activity outdoors. Everyone else should avoid prolonged or heavy exertion.

WORLD:
  • SMOG BLOG - Research by the Atmospheric Lidar Group at the University of Maryland, Baltimore County on understanding atmospheric chemistry and physics in the troposphere with laser remote sensing technology.

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