Timeline Data

This page presents air quality and weather data measured at the selected monitoring location for the past seven days. The data are charted hourly, with ozone and particulate PM2.5 showing Nowcast average bars, color coded with the Air Quality Index (information under the the chart).

Measurement units: micrograms per cubic meter (µg/m3)

Air quality good icon
Good  (1-hr avg PM2.5:   0 - 38 µg/m3      Nowcast PM2.5:   0 - 9.0 µg/m3      Nowcast PM10:   0 - 54 µg/m3)
No cautionary statement.
Air quality moderate icon
Moderate  (1-hr avg PM2.5:   39 - 88 µg/m3      Nowcast PM2.5:   9.1 - 35.4 µg/m3      Nowcast PM10:   55 - 154 µg/m3)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Air quality unhealthy for sensitive groups icon
Unhealthy for Sensitive Groups  (1-hr avg PM2.5:   89 - 138 µg/m3      Nowcast PM2.5:   35.5 - 55.4 µg/m3      Nowcast PM10:   155 - 254 µg/m3)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Air quality unhealthy icon
Unhealthy   (1-hr avg PM2.5:   139 - 351 µg/m3      Nowcast PM2.5:   55.5 - 125.4 µg/m3      Nowcast PM10:   255 - 354 µg/m3)
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.
Air quality very unhealthy icon
Very Unhealthy  (1-hr avg PM2.5:   352 - 525 µg/m3      Nowcast PM2.5:   125.5 - 225.4 µg/m3      Nowcast PM10:   355 - 424 µg/m3)
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.
Air quality hazardous icon
Hazardous  (1-hr avg PM2.5:   526+ µg/m3      Nowcast PM2.5:   225.5+ µg/m3      Nowcast PM10:   425+ µg/m3)
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.
Learn more about the Air Quality Index »

Measurement units: parts per billion (ppb))

Air quality good icon
Good (0 - 54 ppb)
No cautionary statement.
Air quality moderate icon
Moderate (55 - 70 ppb)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Air quality unhealthy for sensitive groups icon
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.
Air quality unhealthy icon
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.
Air quality very unhealthy icon
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.
Learn more about the Air Quality Index »

Measurement units: nanograms per cubic meter (ng/m3)


Infrared black carbon is the traditional method for quantifying fossil fuel-derived black carbon from diesel and other sources.

Ultraviolet black carbon is a strong indicator of biomass and tobacco smoke.

This AQI summary may be slightly different than summaries provided by the EPA as it includes non-regulatory monitors to be more representative of local conditions.