AQI Forecast by County
Saturday, January 18
Sat Sun
Placer
55
63
Sacramento
59
80
Yolo-Solano
57
72

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


Forecast will be issued daily by noon (PST)

A "!" next to a forecast means a Spare The Air Day has been declared for that day.
 
Forecast: AQI   Pollutant
Sat. January 18, 2020:
 59 
PM2.5    
Sun. January 19, 2020:
 80 
PM2.5    
 
Extended Forecast: Condition Pollutant
Mon. January 20, 2020:
Moderate  Moderate
PM2.5    
Tue. January 21, 2020:
Moderate  Moderate
PM2.5    
Wed. January 22, 2020:
Good  Good
PM2.5    
Thu. January 23, 2020:
Moderate  Moderate
PM2.5    
 
Actual: AQI   Pollutant
Fri. January 17, 2020:
 22 
PM2.5    

Weather Conditions:
Saturday, cold overnight temperatures will generate a strong temperature inversion, trapping pollutants near the surface. Therefore, despite light northerly daytime winds gradually bringing cleaner air into the Sacramento region, particle levels will be low-Moderate. Sunday and Monday, cold overnight temperatures will generate strong temperature inversions each evening, continuing to trap pollutants near the ground. In addition, an upper-level ridge of high pressure will strengthen over northern California, reducing vertical mixing in the atmosphere. Furthermore, calm to light winds at the surface will reduce pollutant dispersion. As a result, particle levels will be Moderate on both days.