Latest Week Ozone Summary (PST)

Latest Week Ozone Summary for Selected Regions (Preliminary Data in PST)

Data on this page extracted on May 25, 2017 at 05:34:05

Note: The AQMIS Ozone pages reflect the 2008 National 8-Hour Ozone Standard of 0.075 ppm

Region	Latest 7 Days (ending 05/24/2017)					This Year-to-Date through 05/24/2017
	Latest 7 Days (ending 05/24/2017)					This Year-to-Date through 05/24/2017
	Days Exceeding Standards			Maximum Concentration (ppm)		Maximum Concentration (ppm)
	State		National	Maximum Concentration (ppm)		Maximum Concentration (ppm)
	1-hour	8-hour	8-hour	1-hour	8-hour	1-hour	8-hour
Sacramento Metropolitan Area*	0	2	1	0.090	0.079	0.090	0.079
San Diego Air Basin	0	4	3	0.086	0.078	0.103	0.090
San Francisco Bay Area Air Basin	0	0	0	0.074	0.065	0.074	0.065
San Joaquin Valley Air Basin	3	5	4	0.104	0.091	0.104	0.091
South Coast Air Basin	5	5	5	0.111	0.099	0.115	0.099
Ventura County (Mainland Only)	0	2	0	0.080	0.075	0.084	0.077
Antelope Valley and W. Mojave Desert	1	4	4	0.109	0.084	0.109	0.084
Coachella Valley	2	4	4	0.101	0.090	0.101	0.090
Eastern Kern County	0	3	1	0.087	0.076	0.087	0.076
Imperial County	0	2	0	0.082	0.071	0.104	0.080
Lake County**				N/A	N/A	N/A	N/A
Mountain Counties - Central	0	0	0	0.082	0.070	0.082	0.070
Mountain Counties - Southern	0	2	0	0.077	0.072	0.077	0.072
North Central Coast Air Basin	0	0	0	0.073	0.064	0.073	0.064
Sacramento Valley - Butte County	0	1	0	0.077	0.072	0.077	0.072
Sacramento Valley - Sutter Buttes***	0	0	0	0.027	0.022	0.067	0.064
Sacramento Valley (remaining areas)	0	3	2	0.085	0.082	0.085	0.082
San Luis Obispo County	0	0	0	0.075	0.069	0.082	0.069
Santa Barbara County	0	0	0	0.077	0.066	0.085	0.070
Western Nevada County	0	4	3	0.092	0.087	0.092	0.087


	To see monitoring site details, click a 7-day numeric value.
	To see underlying daily data for area, click on the year-to-date numeric value.
	Cell color is red if national standard level is exceeded; Nat'l stds truncate 4 digit 8-hr avg to 3 decimals.
	Cell color is yellow if state standard level is exceeded.


*	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.
**	The Lake County Air Quality Management District is a non-real time data stream that will be updated monthly.
***	The Sacramento Valley-Sutter Buttes site is a seasonal monitoring site (May through October only).

Standards:
State 1-hr: 0.09 ppm
State 8-hr: 0.070 ppm
National 8-hr: 0.075 ppm
Other Standards (pdf) .