California Air Resources Board
Year-to-Date Ozone Summary
for Selected California Monitoring Sites
   

Sacramento Valley Air Basin
 
January - May
County Site Year Exceedance Days 1-hour
State Federal Max
Sacramento Folsom-
50 Natoma Street*
1994 2 0 0.11 
1995 0 0 0.089
1996 2 0 0.106
1997** 4 0 0.11 

Sacramento Sacramento-
Del Paso Manor
1994 0 0 0.085
1995 2 0 0.104
1996 1 0 0.102
1997** 2 0 0.10 
Previous Period
January - April
Exceedance Days 1-hour
State Federal Max
0 0 0.088
0 0 0.078
0 0 0.088
0 0 0.08 

0 0 0.071
0 0 0.087
1 0 0.102
0 0 0.09 
* The 50 Natoma Street site replaced the Folsom-City Corporation Yard site in 1997.
** All 1997 data are preliminary and subject to further review.  The 1997 data for the "previous period" were submitted approximately a month earlier than the data for the later time period and may have been superseded as a result of review during the intervening month.  
 
San Diego Air Basin
 
January - May
County Site Year Exceedance Days 1-hour
State Federal Max
San Diego Alpine-
Victoria Drive
1994 9 1 0.141
1995 9 0 0.116
1996 10 1 0.133
1997** 12 0 0.109

San Diego Escondido-
Valley Parkway
1994 2 0 0.103
1995 0 0 0.087
1996 3 0 0.112
1997** 0 0 0.092

San Diego Otay Mesa-
Paseo International
1994 2 0 0.098
1995 2 0 0.113
1996 3 0 0.111
1997** 3 0 0.100
Previous Period
January - April
Exceedance Days 1-hour
State Federal Max
6 1 0.141
5 0 0.116
2 0 0.108
2 0 0.102

1 0 0.097
0 0 0.087
1 0 0.097
0 0 0.088

1 0 0.098
2 0 0.113
2 0 0.111
1 0 0.097
** All 1997 data are preliminary and subject to further review.  The 1997 data for the "previous period" were submitted approximately a month earlier than the data for the later time period and may have been superseded as a result of review during the intervening month.  
 
San Francisco Bay Area Air Basin
 
January - May
County Site Year Exceedance Days 1-hour
State Federal Max
Alameda Livermore-
Old 1st Street
1994 0 0 0.08 
1995 0 0 0.082
1996 2 0 0.096
1997** 0 0 0.074

Contra Costa Concord-
2975 Treat Blvd
1994 0 0 0.08 
1995 0 0 0.069
1996 1 0 0.109
1997** 0 0 0.073

Santa Clara San Jose-
935 Piedmont Road
1994 0 0 0.071
1995 0 0 0.072
1996 1 0 0.106
1997** 0 0 0.080
Previous Period
January - April
Exceedance Days 1-hour
State Federal Max
0 0 0.071
0 0 0.070
0 0 0.089
0 0 0.074

0 0 0.066
0 0 0.068
1 0 0.109
0 0 0.071

0 0 0.058
0 0 0.072
0 0 0.087
0 0 0.056
** All 1997 data are preliminary and subject to further review.  The 1997 data for the "previous period" were submitted approximately a month earlier than the data for the later time period and may have been superseded as a result of review during the intervening month.  
 
San Joaquin Valley Air Basin
 
January - May
County Site Year Exceedance Days 1-hour
State Federal Max
Fresno Fresno-
1st Street
1994 2 0 0.099
1995 5 1 0.126
1996 1 0 0.118
1997** 4 0 0.119

Fresno Parlier 1994 2 0 0.102
1995 0 0 0.084
1996 5 2 0.136
1997** 9 0 0.116

Kern Arvin-
Bear Mountain Blvd
1994 8 0 0.114
1995 5 0 0.104
1996 8 1 0.139
1997** 3 0 0.117

Kern Edison 1994 13 0 0.124
1995 8 0 0.112
1996 4 1 0.135
1997** 3 0 0.108
Previous Period
January - April
Exceedance Days 1-hour
State Federal Max
1 0 0.099
1 0 0.105
0 0 0.090
0 0 0.092

0 0 0.085
0 0 0.082
2 1 0.125
2 0 0.097

1 0 0.108
0 0 0.085
4 0 0.106
0 0 0.092

4 0 0.114
2 0 0.102
1 0 0.098
0 0 0.098
** All 1997 data are preliminary and subject to further review.  The 1997 data for the "previous period" were submitted approximately a month earlier than the data for the later time period and may have been superseded as a result of review during the intervening month.  
 
South Coast Air Basin
 
January - May
County Site Year Exceedance Days 1-hour
State Federal Max
Los Angeles Glendora-
Laurel
1994 23 8 0.196
1995 10 5 0.177
1996 16 7 0.197
1997** 19 4 0.16 

Riverside Riverside-
Rubidoux
1994 24 10 0.157
1995 9 3 0.136
1996 17 4 0.203
1997** 24 3 0.15 

San Bernardino Lake Gregory 1994 34 15 0.165
1995 11 1 0.128
1996 22 10 0.234
1997** 25 10 0.15 

San Bernardino San Bernardino-
4th Street
1994 22 9 0.174
1995 9 3 0.138
1996 21 7 0.239
1997** 30 9 0.16 
Previous Period
January - April
Exceedance Days 1-hour
State Federal Max
13 3 0.162
4 1 0.130
9 3 0.139
N/A 0 0.10 

12 6 0.152
4 1 0.125
7 1 0.126
N/A 0 0.11 

17 5 0.165
4 0 0.110
6 2 0.154
N/A 0 0.11 

11 5 0.174
2 0 0.120
6 1 0.139
N/A 0 0.11 
** All 1997 data are preliminary and subject to further review.  The 1997 data for the "previous period" were submitted approximately a month earlier than the data for the later time period and may have been superseded as a result of review during the intervening month.
 
 
Please send questions or comments to:
aqdweb@arb.ca.gov
 
This page last revised on August 10, 1997
 
bluebar
Year-to-Date Ozone  |  Air Quality Data Home Page 
ARB Home Page  |    Search ARB Programs/Topics |   Email ARB Help attendant