AQI Forecast by County
Tuesday, July 17
Tue Wed
El Dorado
115
126
Placer
119
126
Sacramento
101
105
Yolo-Solano
77
84

Air Quality Map
The map below is a 1-hour snapshot. Click to view all hours recorded since midnight.
Current map


Wednesday, July 18 Spare The Air Alert
A Spare The Air alert in the Sacramento region is in effect for tomorrow, Wednesday, July 18. Please make plans now to reduce your driving tomorrow to help reduce air pollution.

Share a ride, take transit or simply bring your lunch to work to avoid an afternoon car trip.

A Spare The Air alert in the Sacramento region will be issued when the AQI for ground-level ozone pollution is forecast to reach 126 or above.

Sacramento Region Ozone Air Quality Forecast updated by noon
Today (Tue, July 17)
119 AQI - Unhealthy for Sensitive Groups
Tomorrow (Wed, July 18)
126 AQI - Unhealthy for Sensitive Groups

Yesterday's High Extended AQI Outlook
Mon, July 16
101 AQI - Unhealthy for Sensitive Groups
Ozone
Thu, July 19
Unhealthy for Sensitive Groups
Fri, July 20
Unhealthy for Sensitive Groups
Sat, July 21
Unhealthy for Sensitive Groups

Air Quality Forecast and Weather Discussion
Tuesday, temperatures over 100F will enhance ozone production in the Sacramento region. In addition, a broad upper-level high pressure system will limit vertical mixing in the atmosphere, and light daytime winds at the surface will reduce pollutant dispersion. Furthermore, smoke from the Ferguson Fire in Mariposa County will be transported northward into the foothills to the east of Sacramento. This smoke will further enhance ozone formation at foothills sites. Therefore, ozone levels will be Unhealthy for Sensitive Groups. Wednesday is a Spare The Air Day in the Sacramento region. As the upper-level ridge of high pressure persists, sunny and hot conditions will continue to enhance ozone formation. In addition, light southwesterly winds will limit pollutant dispersion, and smoke from the Ferguson Fire will continue to impact the foothills east of Sacramento. Therefore, ozone levels will be Unhealthy for Sensitive Groups. Thursday, as the upper-level ridge weakens, onshore winds will strengthen slightly, aiding pollutant dispersion. However, mostly sunny skies and very warm temperatures will continue to enhance ozone production in the Sacramento region, causing ozone levels to be Unhealthy for Sensitive Groups.