Site colors reflect the current ozone Nowcast Air Quality Index
Click a dot to see more information for that location.
Ozone Nowcast Air Quality Index 
Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
No Data Available
Other (non-ozone) Monitoring Site
Good (0-54 ppb)
No cautionary statement.
No cautionary statement.
Moderate (55-70 ppb)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Unhealthy for Sensitive Groups (71-85 ppb)
Children, older adults, active people, and people with lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Unhealthy (86-105 ppb)
Children, older adults, active people, and people with lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Very Unhealthy (106+ ppb)
Children, older adults, active people, and people with lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Good (0-50)
No cautionary statement.
No cautionary statement.
Moderate (51-100)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Unhealthy for Sensitive Groups (101-150)
Children, older adults, active people, and people with lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Unhealthy (151-200)
Children, older adults, active people, and people with lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Very Unhealthy (200+)
Children, older adults, active people, and people with lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
The NowCast is EPA's method for relating hourly data to the Air Quality Index (AQI). It is designed to be responsive to rapidly changing air quality conditions, such as during a wildfire. The NowCast displays air quality for the current hour by using a calculation that involves multiple hours of past data. The NowCast aligns more closely with what people are experiencing, allowing them to protect their health when air quality is poor and help them get outdoors when air quality is good. For ozone, the NowCast method uses the relationship between 1-hour and 8-hour ozone averages during the prior two weeks to predict an 8-hour ozone average that is centered on the current hour.
Site colors reflect the current Nowcast Particulate Matter (PM2.5) Air Quality Index.
Click a dot to see more information for that location.
Particulate Matter (PM2.5) Nowcast Air Quality Index
Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous
No Data Available
Good (0-50)
No cautionary statement.
No cautionary statement.
Moderate (51-100)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Unhealthy for Sensitive Groups (101-150)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with heart or lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Unhealthy (151-200)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Very Unhealthy (201-300)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Hazardous (300-500)
Everyone should avoid all physical activity outdoors. Children, older adults, and people with heart or lung disease (such as asthma) should remain indoors and keep activity levels low. Follow tips for keeping particle levels low indoors.
Everyone should avoid all physical activity outdoors. Children, older adults, and people with heart or lung disease (such as asthma) should remain indoors and keep activity levels low. Follow tips for keeping particle levels low indoors.
The NowCast is EPA's method for relating hourly data to the Air Quality Index (AQI). It is designed to be responsive to rapidly changing air quality conditions, such as during a wildfire. The NowCast displays air quality for the current hour by using a calculation that involves multiple hours of past data. The NowCast aligns more closely with what people are experiencing, allowing them to protect their health when air quality is poor and help them get outdoors when air quality is good. For particulate matter, the NowCast is based on the last 12 hours of particulate measurements, with heavier weighting on the most recent hours.