Annual Ozone Summary (PST)

Latest Year's (Annual) Ozone Summaries for Selected Regions (PST)

Data on this page extracted on July 21, 2017 at 11:48:22

Year 2014, 2015 and 2016 are whole years
Year 2017 data are through 7/21/2017

Click Here to view data for all years through yesterday

Note: The AQMIS Ozone pages reflect the 2015 National 8-Hour Ozone Standard of 0.070 ppm
     
     Region
Year
National
Exceedance Days 2
Maximum
Concentration (ppm) 3
National Design
Value (ppm) 4
 
1-hr Std
0.12
ppm
8-hr Std
0.070
ppm
1-hr
8-hr
8-hr Std
0.075
ppm
8-hr Std
0.070
ppm
     Sacramento Metropolitan Area 5
0.085
0.085
 
0.081
0.081
0.085
0.085
0.082
0.082
     San Diego Air Basin
0.079
0.079
 
0.079
0.079
0.081
0.081
0.083
0.083
     San Francisco Bay Area Air Basin
0.072
0.072
 
0.073
0.073
0.074
0.074
0.068
0.068
     San Joaquin Valley Air Basin
0.095
0.095
 
0.093
0.093
0.094
0.094
0.091
0.091
     South Coast Air Basin
0.102
0.102
 
0.102
0.102
0.108
0.108
0.112
0.112
     Ventura County (Mainland Only)
0.079
0.079
 
0.077
0.077
0.077
0.077
0.075
0.075
     Antelope Valley and W. Mojave Desert
0.092
0.092
 
0.090
0.090
0.091
0.091
0.096
0.096
     Coachella Valley
0.091
0.091
 
0.088
0.088
0.087
0.087
0.088
0.088
     Eastern Kern County
0.084
0.084
 
0.083
0.083
0.084
0.084
0.081
0.081
     Imperial County
0.080
0.080
 
0.078
0.078
0.076
0.076
0.077
0.077
     Lake County 6
0.061
0.061
 
0.059
0.059
0.058
0.058
0.053
0.053
     Mountain Counties - Central
0.072
0.072
 
0.073
0.073
0.076
0.076
0.076
0.076
     Mountain Counties - Southern
0.078
0.078
 
0.075
0.075
0.079
0.079
0.079
0.079
     North Central Coast Air Basin
0.070
0.070
 
0.068
0.068
0.069
0.069
0.066
0.066
     Sacramento Valley - Butte County
0.075
0.075
 
0.074
0.074
0.075
0.075
0.074
0.074
     Sacramento Valley - Sutter Buttes 7
0.074
0.074
 
0.072
0.072
0.075
0.075
0.074
0.074
     Sacramento Valley (remaining areas)
0.075
0.075
 
0.074
0.074
0.079
0.079
0.080
0.080
     San Luis Obispo County
0.076
0.075
 
0.073
0.072
0.072
0.072
0.070
0.070
     Santa Barbara County
0.068
0.068
 
0.067
0.067
0.067
0.067
0.064
0.064
     Western Nevada County
0.078
0.078
 
0.081
0.081
0.084
0.083
0.087
0.086
 


  N/A: Data not available  
  To see more years for area, click on area name.  
  To see monitoring site details, click on a specific year of interest.  
  To see underlying daily data, click on reported value for a year and region of interest.  
1 Data for year and region are preliminary and subject to further review.
 
2 The number of exceedance days equals the number of distinct days on which the relevant standard was exceeded at any monitoring site in the region.  If the standard was exceeded at more than one site on a given day, it only counts as one exceedance day for the broader region. The National 1-hour exceedance days are from the highest (Max) site.
 
3 The 8-hour maximum concentration is calculated using the State method. State Stds round 4 digit 8-Hr avg. data to 3 decimals; National Stds truncate to 3 decimals.
 
4 The federal 8-hour design value is based on the "three year average" of the annual 4th high.
 
5 The Sacramento Metropolitan Area includes Sacramento Metropolitan Air Quality Management District, Yolo-Solano Air Pollution Control District, the southern third of Feather River Air Quality Management District, and all of El Dorado and Placer Counties except for that portion in the Lake Tahoe Air Basin.

6 The Lake County Air Quality Management District is a non-real time data stream that will be updated monthly.

7 Seasonal Ozone Sites

Standards:
State 1-hr: 0.090 ppm
State 8-hr: 0.070 ppm
National 1-hr: 0.12 ppm
2008 National 8-hr: 0.075 ppm
2015 National 8-hr: 0.070 ppm

Other Standards (pdf)
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