California Air Resources Board
January - December
Year 2000 Ozone Summary
for Selected California Monitoring Sites
   

Greater Sacramento Planning Area
County Site Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
Sacramento Folsom-
50 Natoma Street¹
1997 19 1 8 0.125 0.101
1998 31 10 26 0.151 0.137
1999 22 4 18 0.147 0.129
2000** 16 1 15 0.13   0.102

Sacramento Sacramento-
Del Paso Manor
1997 6 0 1 0.108 0.094
1998 19 5 10 0.160 0.130
1999 12 1 6 0.131 0.110
2000** 13 0 9 0.12   0.100

Sacramento Sloughhouse 1997² 5 2 3 0.143 0.107
1998 27 8 24 0.149 0.115
1999 27 4 19 0.148 0.113
2000** 21 3 15 0.14   0.104
Area* Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
Greater Sacramento Planning Area
Summary
1997 25 4 19 0.145 0.107
1998 47 13 32 0.163 0.137
1999 53 7 47 0.160 0.129
2000** 44 7 37 0.14   N/A
¹ The 50 Natoma Street site replaced the Folsom-City Corporation Yard site in 1997.
² Partial year of monitoring.  
* For the Area summary statistics, the number of exceedance days equals the number of distinct days on which the relevant standard was exceeded at any monitoring site in the area.  If the standard was exceeded at more than one site on a given day, it only counts as one exceedance day for the broader area.  
** All 2000 data are preliminary and subject to further review.  
 
San Diego Air Basin
County Site Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
San Diego Alpine-
Victoria Drive
1997 29 1 11 0.136 0.112
1998 47 8 32 0.164 0.141
1999 21 0 15 0.124 0.100
2000** 19 0 12 0.121 0.105

San Diego Escondido-
Valley Parkway
1997 5 0 2 0.114 0.090
1998 9 0 5 0.122 0.092
1999 1 0 0 0.104 0.080
2000** 6 0 3 0.124 0.106

San Diego Otay Mesa-
Paseo International
1997 7 0 0 0.122 0.082
1998 0 0 0 0.094 0.078
1999 1 0 0 0.101 0.077
2000** 0 0 0 0.086 0.060
Area* Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
San Diego Air Basin Summary 1997 43 1 16 0.136 0.112
1998 54 9 35 0.164 0.141
1999 27 0 16 0.124 0.100
2000** 24 0 16 0.124 N/A
* For the Area summary statistics, the number of exceedance days equals the number of distinct days on which the relevant standard was exceeded at any monitoring site in the area.  If the standard was exceeded at more than one site on a given day, it only counts as one exceedance day for the broader area.  
** All 2000 data are preliminary and subject to further review.  
 
San Francisco Bay Area Air Basin
County Site Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
Alameda Livermore-
Rincon¹
1997 3 0 0 0.114 0.084
1998 21 6 10 0.146 0.110
1999 14 2 5 0.146 0.116
2000** 6 1 2 0.152 0.114

Contra Costa Concord-
2975 Treat Blvd
1997 2 0 0 0.099 0.081
1998 13 2 6 0.147 0.109
1999 8 2 6 0.156 0.122
2000** 2 1 1 0.138 0.097

Santa Clara San Jose-
935 Piedmont Road
1997 1 0 0 0.095 0.071
1998 5 1 0 0.129 0.082
1999 2 0 0 0.116 0.082
2000** 0 0 0 0.076 0.067
Area* Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
San Francisco Bay Area Air Basin
Summary
1997 8 0 0 0.114 0.084
1998 29 8 16 0.147 0.111
1999 20 3 9 0.156 0.122
2000** 12 3 4 0.152 0.114
¹ The new Livermore-Rincon site, which is being considered as a replacement for the Livermore-Old 1st Street site, started operating at the begining of 2000.
* For the Area summary statistics, the number of exceedance days equals the number of distinct days on which the relevant standard was exceeded at any monitoring site in the area.  If the standard was exceeded at more than one site on a given day, it only counts as one exceedance day for the broader area.  
** All 2000 data are preliminary and subject to further review.  
 
San Joaquin Valley Air Basin
County Site Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
Fresno Clovis-
N Villa Avenue
1997 79 9 69 0.147 0.127
1998 65 26 62 0.169 0.130
1999 56 5 49 0.142 0.121
2000** 32 2 26 0.130 0.104

Fresno Fresno-
1st Street
1997 30 1 23 0.128 0.107
1998 46 15 44 0.151 0.118
1999 53 4 45 0.135 0.123
2000** 48 5 41 0.143 0.109

Fresno Parlier 1997 68 9 48 0.137 0.112
1998 64 13 54 0.164 0.120
1999 81 15 68 0.155 0.109
2000** 86 21 72 0.171 0.126

Kern Arvin-
Bear Mountain Blvd
1997 57 7 46 0.134 0.112
1998 71 12 64 0.151 0.123
1999 94 9 85 0.130 0.112
2000** 82 9 73 0.145 0.117

Kern Edison 1997 50 3 30 0.146 0.118
1998 71 22 61 0.165 0.136
1999 68 5 55 0.140 0.110
2000** 72 9 58 0.151 0.117
Area* Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
San Joaquin Valley Air Basin Summary 1997 110 16 95 0.147 0.127
1998 90 39 84 0.169 0.136
1999 122 28 117 0.155 0.123
2000** 109 31 89 0.171 N/A
* For the Area summary statistics, the number of exceedance days equals the number of distinct days on which the relevant standard was exceeded at any monitoring site in the area.  If the standard was exceeded at more than one site on a given day, it only counts as one exceedance day for the broader area.  
** All 2000 data are preliminary and subject to further review.  
 
South Coast Air Quality Management District
County Site Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
Los Angeles Glendora-
Laurel
1997 67 18 24 0.170 0.130
1998 61 28 37 0.222 0.171
1999 25 3 7 0.142 0.103
2000** 39 11 21 0.172 0.146

Riverside Riverside-
Rubidoux
1997 89 13 52 0.187 0.129
1998 70 32 57 0.195 0.169
1999 38 3 22 0.142 0.110
2000** 41 3 28 0.140 0.112

San Bernardino Crestline¹ 1997 92 29 66 0.205 0.138
1998 97 57 86 0.244 0.206
1999 93 30 82 0.174 0.142
2000** 85 17 73 0.176 0.148

San Bernardino Rim High School² 1997 N/A N/A N/A N/A N/A
1998 92 49 81 0.237 0.201
1999 92 23 81 0.160 0.142
2000** 102 29 96 0.185 0.155

San Bernardino San Bernardino-
4th Street
1997 102 32 63 0.197 0.137
1998 65 39 47 0.214 0.180
1999 45 14 30 0.159 0.132
2000** 48 7 24 0.149 0.126
Area* Year Exceedance Days Maximum
State Federal Concentrations (ppm)
1-hr 1-hr 8-hr 1-hr 8-hr
South Coast Air Quality Management District Summary² 1997 144  64 118 0.205 0.148
1998 107  60  93 0.244 0.206
1999 111  39  93 0.174 0.142
2000** 125  40 116 0.185 N/A
¹ Also known as Lake Gregory in the past.
² The Rim High School site is a Children Health Study site, and not a South Coast SLAMS or NAMS site.  It is excluded from the district summary statistics.  
* For the Area summary statistics, the number of exceedance days equals the number of distinct days on which the relevant standard was exceeded at any monitoring site in the area.  If the standard was exceeded at more than one site on a given day, it only counts as one exceedance day for the broader area.  
** All 2000 data are preliminary and subject to further review.  
 
 
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aqdweb@cleanair.arb.ca.gov
 
This page last revised on January 16, 2001
 
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