tips
Forecast By County
Saturday, September 20
Sat Sun
El Dorado
47
45
Placer
49
47
Sacramento
49
47
Yolo-Solano
36
34

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

Spare The Air Days
2014
Spare The Air Days:
4

Current Conditions: PM2.5

AQI Look-up Table for Ozone concentrations
September 20, 2014 7 p.m. (PDT)
Site Name Current Ozone AQI Max Ozone AQI (PST)
Auburn   36 42 at 12 p.m.
Colfax   39 46 at 12 p.m.
Cool (Seasonal)   42 46 at 12 p.m.
Davis - UCD Campus   27 36 at 12 p.m.
Elk Grove   29 34 at 12 p.m.
Folsom   41 44 at 4 p.m.
Grass Valley   50 54 at 4 p.m.
Lincoln   39 44 at 12 p.m.
North Highlands   39 46 at 12 p.m.
Placerville   38 41 at 12 p.m.
Roseville - N.Sunrise/Douglas   42 47 at 12 p.m.
Sacramento - Del Paso Manor   33 42 at 12 p.m.
Sacramento - T Street   30 38 at 12 p.m.
Sloughhouse   34 38 at 12 p.m.
Vacaville   26 32 at 12 p.m.
Woodland   32 40 at 12 p.m.
Yuba City   40 41 at 12 p.m.

* The Sacramento region is designated as a severe nonattainment area for the 1997 federal 8-hour ozone standard with an attainment deadline of June 2019. This federal nonattainment area includes all of Sacramento and Yolo counties and portions of El Dorado, Placer, Sutter and Solano counties. It does not include Nevada County (Grass Valley), which has its own nonattainment area for outreach, planning and regulatory purposes. Nor does it include Yuba City, which is outside of this federal boundary.


AQI Chart - EnglishAQI en español
AQI Look-up Table for PM2.5 concentrations
September 20, 2014 7 p.m. (PDT)
Site Name Current PM2.5 AQI Max PM2.5 AQI (PST)
Auburn   92 363 at 12 p.m.
Colfax   177 218 at 3 p.m.
Davis - UCD Campus   37 49 at 2 p.m.
Elk Grove   42 42 at 6 p.m.
Folsom   39 45 at 4 p.m.
Grass Valley   163 164 at 2 p.m.
Lincoln   52 157 at 1 p.m.
Rio Vista   9 25 at 12 a.m.
Roseville - N.Sunrise/Douglas   52 52 at 6 p.m.
Sacramento - Del Paso Manor   26 25 at 6 p.m.
Sacramento - T Street   23 51 at 12 p.m.
Sloughhouse   17 32 at 3 p.m.
Vacaville   0 2 at 12 a.m.
Woodland   6 7 at 12 p.m.

AQI Chart - EnglishAQI en español

The real-time Particulate Matter (PM2.5) data displayed on this page is for public information reporting and forecasting only. Per state and federal regulations, it is not used for attainment determination purposes.

Compared to ground-level ozone programs, PM2.5 monitoring, forecasting and mapping is still in its infancy. Fine Particulate Matter, known as PM2.5, is a complex mixture that may contain soot, smoke, metals, nitrates, sulfates, dust, water and tire rubber. It can be directly emitted, as in smoke from a fire, or it can form in the atmosphere from reactions of gases such as nitrogen oxides.

Five (5) sites in Sacramento County:
  • Elk Grove
  • Folsom
  • Del Paso Manor (near Watt Ave. and El Camino Ave.)
  • Sloughhouse
  • T Street (13th & T in downtown Sacramento)
Two (2) sites in Yolo County:
  • Davis
  • Woodland
Two (2) sites in Solano County:
  • Rio Vista
  • Vacaville
Three (3) sites in Placer County:
  • Auburn
  • Lincoln
  • Roseville (N. Sunrise/Douglas Blvd.)
One (1) site in Nevada County:
  • Grass Valley