| 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
|
0-9
|
0-54
|
None.
|
None.
|
Air quality is considered to be satisfactory, and air pollution poses little or no risk.
|
|
Moderate
|
39-88
|
172-383
|
9.1-35.4
|
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 symptoms in sensitive individuals, aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly.
|
|
Unhealthy
|
139-351
|
634-826
|
55.5-125.4
|
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
|
125.5-225.4
|
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+
|
225.5+
|
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.
|