Latest Year's (Annual) Ozone Summaries for Selected Regions (PST)
Data on this page extracted on March 18, 2024 at 18:13:03
Year 2024 data are through 3/18/2024
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 |
||||||
8-hr Std
0.08 ppm |
8-hr Std
0.075 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 |
7
|
0.082
|
0.082
|
|||||||
1
|
0.081
|
0.081
|
||||||||
1
|
0.076
|
0.076
|
||||||||
0
|
0.063
|
0.063
|
||||||||
San Diego Air Basin |
0
|
0.078
|
0.078
|
|||||||
1
|
0.079
|
0.079
|
||||||||
1
|
0.079
|
0.079
|
||||||||
0
|
0.070
|
0.070
|
||||||||
San Francisco Bay Area Air Basin |
2
|
0.071
|
0.071
|
|||||||
0
|
0.069
|
0.069
|
||||||||
0
|
0.070
|
0.070
|
||||||||
0
|
0.057
|
0.057
|
||||||||
San Joaquin Valley Air Basin |
29
|
0.093
|
0.093
|
|||||||
17
|
0.094
|
0.094
|
||||||||
16
|
0.090
|
0.090
|
||||||||
0
|
0.073
|
0.073
|
||||||||
South Coast Air Basin |
68
|
0.114
|
0.114
|
|||||||
66
|
0.113
|
0.113
|
||||||||
60
|
0.106
|
0.106
|
||||||||
0
|
0.086
|
0.086
|
||||||||
Ventura County (Mainland Only) |
0
|
0.076
|
0.076
|
|||||||
0
|
0.078
|
0.078
|
||||||||
0
|
0.075
|
0.075
|
||||||||
0
|
0.067
|
0.067
|
||||||||
Antelope Valley and W. Mojave Desert |
28
|
0.090
|
0.090
|
|||||||
12
|
0.090
|
0.090
|
||||||||
11
|
0.090
|
0.090
|
||||||||
0
|
0.074
|
0.074
|
||||||||
Coachella Valley |
7
|
0.086
|
0.086
|
|||||||
3
|
0.087
|
0.087
|
||||||||
4
|
0.085
|
0.085
|
||||||||
0
|
0.073
|
0.073
|
||||||||
Mojave Desert (remaining areas) |
0
|
0.056
|
0.073
|
|||||||
0
|
0.072
|
0.072
|
||||||||
0
|
0.069
|
0.069
|
||||||||
0
|
0.061
|
0.061
|
||||||||
Eastern Kern County |
0
|
N/A
|
N/A
|
|||||||
0
|
N/A
|
0.073
|
||||||||
0
|
0.064
|
0.064
|
||||||||
0
|
N/A
|
N/A
|
||||||||
Imperial County |
2
|
0.080
|
0.080
|
|||||||
0
|
0.077
|
0.077
|
||||||||
4
|
0.077
|
0.077
|
||||||||
0
|
0.068
|
0.068
|
||||||||
Lake County 6 |
0
|
0.054
|
0.054
|
|||||||
0
|
0.055
|
0.055
|
||||||||
0
|
0.050
|
0.050
|
||||||||
N/A
|
N/A
|
N/A
|
||||||||
Mountain Counties - Central |
0
|
0.070
|
0.070
|
|||||||
0
|
0.068
|
0.068
|
||||||||
0
|
0.066
|
0.066
|
||||||||
0
|
0.056
|
0.056
|
||||||||
Mountain Counties - Southern |
3
|
0.081
|
0.081
|
|||||||
1
|
0.084
|
0.083
|
||||||||
0
|
0.073
|
0.073
|
||||||||
0
|
0.063
|
0.062
|
||||||||
North Central Coast Air Basin |
0
|
0.066
|
0.066
|
|||||||
0
|
0.067
|
0.067
|
||||||||
0
|
0.066
|
0.066
|
||||||||
0
|
0.057
|
0.057
|
||||||||
Sacramento Valley - Butte County |
0
|
0.070
|
0.070
|
|||||||
0
|
0.071
|
0.071
|
||||||||
0
|
0.068
|
0.068
|
||||||||
0
|
0.059
|
0.058
|
||||||||
Sacramento Valley - Sutter Buttes 7 |
2
|
0.075
|
0.075
|
|||||||
0
|
0.076
|
0.076
|
||||||||
0
|
0.071
|
0.071
|
||||||||
N/A
|
N/A
|
N/A
|
||||||||
Sacramento Valley (remaining areas) |
0
|
0.067
|
0.067
|
|||||||
0
|
0.068
|
0.068
|
||||||||
0
|
0.068
|
0.068
|
||||||||
0
|
0.061
|
0.061
|
||||||||
Tuscan Buttes |
0
|
0.073
|
0.072
|
|||||||
0
|
0.074
|
0.073
|
||||||||
0
|
0.072
|
0.072
|
||||||||
N/A
|
N/A
|
N/A
|
||||||||
Eastern San Luis Obispo County |
0
|
0.074
|
0.074
|
|||||||
0
|
0.074
|
0.073
|
||||||||
0
|
0.071
|
0.071
|
||||||||
0
|
0.063
|
0.063
|
||||||||
San Luis Obispo County (remaining areas) |
0
|
0.065
|
0.065
|
|||||||
0
|
0.063
|
0.063
|
||||||||
0
|
0.061
|
0.061
|
||||||||
0
|
0.054
|
0.054
|
||||||||
Santa Barbara County |
0
|
0.065
|
0.065
|
|||||||
0
|
0.062
|
0.064
|
||||||||
0
|
0.061
|
0.061
|
||||||||
0
|
0.056
|
0.056
|
||||||||
Western Nevada County |
7
|
0.082
|
0.080
|
|||||||
0
|
0.083
|
0.081
|
||||||||
0
|
0.080
|
0.080
|
||||||||
0
|
0.064
|
0.063
|
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. |
|
3 |
The 8-hour maximum concentration is calculated using the federal method.
Fed Stds truncate 4 digit 8-Hr avg. data 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 |
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)