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Level of Health Concern Hourly Concentration (μg/m3) Daily Concentration (μg/m3) Great Basin Unified Air Pollution Control District Health Advisory Cautionary Statement Health Effects Statement PM2.5 PM10 PM2.5 PM10 Good 0-38 0-171 0-12 0-54 None. None. Air quality is considered to be satisfactory, and air pollution poses little or no risk. Moderate 39-88 172-383 12.1-35.4 55-154 None. Unusually sensitive people should consider reducing prolonged or heavy exertion. 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 89-138 384-633 35.5-55.4 155-254 Stage 1 Air Pollution Health Advisory issued when hourly PM2.5 reaches 100 μg/m3 or when hourly PM10 reaches 400 μg/m3 Health Alert: People with heart or lung disease, older adults, and children should reduce prolonged or heavy exertion. The general public is not likely to be effected. Increased likelihood of respiratory in sensitive individuals, aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly. Levels of Health Concern from Smoke (PM 2.5) or Dust (PM10) in the Air ---PAGE BREAK--- Unhealthy 139-351 634-826 55.5-150.4 255-354 Stage 2 Air Pollution Health Advisory issued when hourly PM2.5 reaches 200 μg/m3 or when hourly PM10 reaches 800 μg/m3 Health Alert: Everyone may begin to experience health effects; people with heart or lung disease, older adults, and children should avoid prolonged or heavy exertion. 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 Unhealthy 352-526 827-891 150.5-250.4 355-424 Stage 2 Air Pollution Health Advisory Health Alert: People with heart or lung disease, older adults, and children should avoid all physical activity outdoors. Everyone else should avoid prolonged or heavy exertion. 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 527+ 892+ 250.5+ 425+ Stage 2 Air Pollution Health Advisory Health Warning of Emergency Conditions: Everyone should avoid any outdoor exertion; people with respiratory or heart disease, the elderly, and children should remain indoors. 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. ---PAGE BREAK---