APPEN

Air Quality Trend 

Ozone, PM2.5, 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, C Introduction ....................................................................................... Ozone ................................................................................................. PM2.5 ..................................................................................................

 Carbon Monoxide .............................................................................. Nitrogen Dioxide ................................................................................ Sulfur Dioxide ....................................................................................

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

List of 

 Ozone Air Quality Trend Data: A-1 Annual 4th High 8-Hour .................................................. A-2 8-Hour Design Value ......................................................... A-3 Maximum 1-Hour Concentration ..................................... A-4 1-Hour Design Value ......................................................... A-5 Days Above National 8-Hour Standard ........................... PM2.5 Air Quality Trend Data:

 A-6 98th Percentile 24-Hour Concentration ............................

 A-7 24-Hour Design Value ....................................................... A-8 Maximum Annual Average ................................................ A-9 Annual Design Value ......................................................... Carbon Monoxide Air Quality Trend Data:  A-10 Peak 8-Hour Indicator....................................................... A-11 Maximum 1-Hour Concentration ..................................... A-12 Maximum 8-Hour Concentration ..................................... A-13 Days Above National 8-Hour Standard ........................... Nitrogen Dioxide Air Quality Trend Data:  A-14 Maximum 1-Hour Concentration ..................................... A-15 1-Hour Design Value ......................................................... A-16 Annual Average Design Value ........................................... Sulfur Dioxide Air Quality Trend Data:  A-17 Maximum 1-Hour Concentration ..................................... A-18 1-Hour Design Value ......................................................... A-19 Maximum 24-Hour Concentration ................................... A-20 Maximum Annual Average ................................................

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

IntroductionThis appendix contains air quality trend data for each of California’s 15 air basins, organized by pollutant. The five pollutants included are ozone, particulate matter (PM2.5), carbon monoxide (CO), nitrogen 

dioxide (NO2), and sulfur dioxide (SO2). The statistics are the same 

as those presented in Chapter 4 with the addition of CO, and the time period covered is 1992 through 2011, for PM2.5. the time period 

is 1999 to 2011.Air quality statistics can fluctuate from year-to-year because of the influence of meteorology and/or changes in emissions. However, the statistics can also vary because of a change in monitoring site. The design value and maximum value statistics listed here reflect the highest value for the statistic at any site in the area. As a result, the statistic may not reflect the same site during the entire trend period. For example, the maximum 8-hour CO concentrations in Imperial County in the Salton Sea Air Basin were below the level of the national standard from 1992 through 1993. In 1994, however, the concentration shows a significant increase, and the national standard was violated. The CO concentrations in the Salton Sea Air Basin did not suddenly increase during 1994. Instead, monitoring began at a new site in Calexico, and the concentrations at the new site were higher than at the existing sites in the air basin. Information about the time periods for which air quality data are available for different pollutants at sites in California and Baja, Mexico is available online at www.arb.ca.gov/adam/netrpt/.Since the design value and maximum air quality statistics reflect the highest values in the area, the monitoring sites represented also may not be consistent among the various statistics during a particular year. For example, the monitoring site reflected in the maximum 1-hour ozone concentration may not be the same as the monitoring site reflected in the maximum 4th high 8-hour ozone concentration.

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

OzoneAnnual 4th High 8-Hour (ppm)8-Hour Design Value (ppm)Table A-1 Table A-2 AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 0.091 0.075 0.084 0.080 0.078 0.077 0.082 0LAKE COUNTY 0.051 0.062 0.065 0.057 0.060 0.058 0.055 0LAKE TAHOE 0.078 0.066 0.073 0.071 0.069 0.066 0.073 0MOJAVE DESERT 0.140 0.137 0.141 0.137 0.133 0.118 0.131 0MOUNTAIN COUNTIES 0.098 0.100 0.102 0.104 0.104 0.096 0.115 0NORTH CENTRAL COAST 0.083 0.082 0.078 0.083 0.094 0.076 0.088 0NORTH COAST 0.063 0.067 0.070 0.071 0.066 0.081 0.086 0NORTHEAST PLATEAU 0.061 0.053 0.062 0.057 0.058 0.059 0.066 0SACRAMENTO METROPOLITAN AREA 0.111 0.103 0.106 0.111 0.104 0.092 0.115 0SACRAMENTO VALLEY 0.111 0.103 0.106 0.111 0.104 0.091 0.113 0SALTON SEA 0.115 0.112 0.114 0.107 0.115 0.105 0.107 0SAN DIEGO 0.110 0.112 0.107 0.107 0.099 0.093 0.114 0SAN FRANCISCO BAY AREA 0.082 0.082 0.082 0.099 0.099 0.072 0.096 0SAN JOAQUIN VALLEY 0.110 0.117 0.118 0.123 0.126 0.115 0.124 0SOUTH CENTRAL COAST 0.112 0.111 0.117 0.123 0.118 0.105 0.113 0SOUTH COAST 0.183 0.172 0.163 0.166 0.154 0.135 0.183 0AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 0.081 0.078 0.082 0.079 0.079 0.077 0.079 0LAKE COUNTY 0.055 0.057 0.059 0.061 0.060 0.058 0.057 0LAKE TAHOE 0.075 0.061 0.070 0.071 0.068 0.069 0

MOJAVE DESERT 0.147 0.139 0.138 0.133 0.131 0.124 0.127 0MOUNTAIN COUNTIES 0.089 0.096 0.097 0.099 0.103 0.099 0.103 0NORTH CENTRAL COAST 0.084 0.083 0.081 0.081 0.085 0.084 0.086 0NORTH COAST 0.051 0.050 0.066 0.069 0.069 0.072 0.077 0NORTHEAST PLATEAU 0.057 0.051 0.058 0.057 0.059 0.058 0.061 0SACRAMENTO METROPOLITAN AREA 0.105 0.110 0.104 0.106 0.106 0.099 0.103 0SACRAMENTO VALLEY 0.105 0.110 0.104 0.106 0.106 0.097 0.095 0SALTON SEA 0.121 0.118 0.113 0.110 0.111 0.107 0.107 0SAN DIEGO 0.118 0.112 0.109 0.108 0.104 0.099 0.102 0SAN FRANCISCO BAY AREA 0.082 0.081 0.082 0.087 0.093 0.090 0.089 0SAN JOAQUIN VALLEY 0.115 0.112 0.111 0.119 0.119 0.115 0.115 0SOUTH CENTRAL COAST 0.118 0.115 0.112 0.117 0.119 0.115 0.112 0SOUTH COAST 0.180 0.177 0.171 0.165 0.161 0.148 0.154 0

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Maximum 1-Hour Concentration (ppm)1-Hour Design Value (ppm)Ozone

Table A-3 Table A-4 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 0.150 0.090 0.120 0.110 0.095 0.092 0.092 0LAKE COUNTY 0.080 0.080 0.090 0.070 0.090 0.080 0.080 0LAKE TAHOE 0.100 0.090 0.086 0.092 0.083 0.095 0.081 0MOJAVE DESERT 0.230 0.200 0.188 0.240 0.175 0.187 0.202 0MOUNTAIN COUNTIES 0.130 0.120 0.130 0.146 0.138 0.145 0.163 0NORTH CENTRAL COAST 0.110 0.110 0.101 0.138 0.120 0.112 0.124 0NORTH COAST 0.090 0.090 0.100 0.100 0.080 0.100 0.130 0NORTHEAST PLATEAU 0.080 0.070 0.080 0.070 0.070 0.082 0.078 0SACRAMENTO METROPOLITAN AREA 0.170 0.150 0.145 0.156 0.157 0.145 0.163 0SACRAMENTO VALLEY 0.170 0.150 0.145 0.156 0.157 0.143 0.160 0SALTON SEA 0.170 0.210 0.180 0.232 0.180 0.160 0.236 0SAN DIEGO 0.170 0.187 0.147 0.162 0.138 0.136 0.164 0SAN FRANCISCO BAY AREA 0.130 0.130 0.130 0.155 0.138 0.114 0.147 0SAN JOAQUIN VALLEY 0.160 0.160 0.175 0.173 0.165 0.147 0.169 0SOUTH CENTRAL COAST 0.150 0.146 0.164 0.169 0.158 0.137 0.174 0SOUTH COAST 0.300 0.280 0.300 0.256 0.239 0.205 0.244 0AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 0.140 0.140 0.130 0.100 0.100 0.092 0.091 0LAKE COUNTY 0.080 0.080 0.080 0.080 0.080 0.080 0.080 0LAKE TAHOE 0.090 0.080 0.083 0.086 0.083 0.083 0.081 0MOJAVE DESERT 0.230 0.200 0.190 0.210 0.182 0.175 0.167 0MOUNTAIN COUNTIES 0.150 0.120 0.124 0.124 0.136 0.145 0.145 0NORTH CENTRAL COAST 0.110 0.110 0.110 0.104 0.114 0.114 0.114 0NORTH COAST 0.080 0.090 0.090 0.090 0.090 0.090 0.110 0NORTHEAST PLATEAU 0.080 0.070 0.070 0.070 0.070 0.070 0.078 0SACRAMENTO METROPOLITAN AREA 0.160 0.150 0.142 0.145 0.145 0.145 0.149 0SACRAMENTO VALLEY 0.160 0.150 0.142 0.145 0.145 0.143 0.149 0SALTON SEA 0.170 0.170 0.152 0.205 0.192 0.180 0.155 0SAN DIEGO 0.170 0.154 0.150 0.146 0.141 0.137 0.133 0SAN FRANCISCO BAY AREA 0.130 0.120 0.121 0.138 0.138 0.138 0.138 0SAN JOAQUIN VALLEY 0.160 0.160 0.160 0.164 0.165 0.164 0.161 0SOUTH CENTRAL COAST 0.150 0.150 0.146 0.157 0.158 0.152 0.144 0SOUTH COAST 0.300 0.300 0.280 0.250 0.231 0.215 0.217 0

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Days Above National 8-Hour StandardOzoneTable A-5 AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 19 4 28 5 12 11 14 LAKE COUNTY 0 000001

LAKE TAHOE 5 022001MOJAVE DESERT 156 147 161 131 132 123 105 MOUNTAIN COUNTIES 85 80 93 89 102 71 86 NORTH CENTRAL COAST 14 20 13 16 34 6 17 

NORTH COAST 0 022047NORTHEAST PLATEAU 0 000000

SACRAMENTO METROPOLITAN AREA 90 48 73 64 76 45 60 SACRAMENTO VALLEY 82 49 87 64 82 44 89 SALTON SEA 101 124 141 130 99 126 81 SAN DIEGO 105 91 90 94 64 43 58 SAN FRANCISCO BAY AREA 18 18 13 22 25 5 24 

SAN JOAQUIN VALLEY 155 144 137 142 143 138 112 SOUTH CENTRAL COAST 103 80 110 110 104 80 75 SOUTH COAST 191 183 164 150 141 155 120 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

98th Percentile 24-Hour Concentration (μg/m

3)

PM2.5

24-Hour Design Value (μg/m

3)

Table A-6 Table A-7 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS LAKE COUNTY LAKE TAHOE MOJAVE DESERT MOUNTAIN COUNTIES NORTH CENTRAL COAST NORTH COAST 

NORTHEAST PLATEAU 

SACRAMENTO METROPOLITAN AREA 96.0 SACRAMENTO VALLEY 96.0 SALTON SEA SAN DIEGO SAN FRANCISCO BAY AREA SAN JOAQUIN VALLEY 1SOUTH CENTRAL COAST SOUTH COAST 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 

LAKE COUNTY LAKE TAHOE MOJAVE DESERT 

MOUNTAIN COUNTIES NORTH CENTRAL COAST NORTH COAST NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA SACRAMENTO VALLEY SALTON SEA SAN DIEGO SAN FRANCISCO BAY AREA SAN JOAQUIN VALLEY SOUTH CENTRAL COAST SOUTH COAST 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Maximum Annual Average (μg/m

3)

PM2.5Annual Design Value (μg/m

3)

Table A-8 Table A-9 AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 

LAKE COUNTY LAKE TAHOE MOJAVE DESERT MOUNTAIN COUNTIES NORTH CENTRAL COAST NORTH COAST 

NORTHEAST PLATEAU 

SACRAMENTO METROPOLITAN AREA SACRAMENTO VALLEY SALTON SEA SAN DIEGO SAN FRANCISCO BAY AREA SAN JOAQUIN VALLEY SOUTH CENTRAL COAST SOUTH COAST 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS LAKE COUNTY LAKE TAHOE MOJAVE DESERT 

MOUNTAIN COUNTIES NORTH CENTRAL COAST NORTH COAST NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA SACRAMENTO VALLEY SALTON SEA 

SAN DIEGO SAN FRANCISCO BAY AREA SAN JOAQUIN VALLEY SOUTH CENTRAL COAST SOUTH COAST 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Carbon MonoxidePeak 8-Hour Indicator (ppm)Table A-10 AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 3.5 5.0 4.7 4.6 4.0 4.0 3.9 LAKE COUNTYLAKE TAHOE 10.2 8.7 8.3 7.8 7.0 5.6 5.0 

MOJAVE DESERT 6.5 6.2 6.1 5.8 7.4 4.8 4.4 MOUNTAIN COUNTIES 2.9 2.9 2.8 2.8 2.7 2.4 5.1 NORTH CENTRAL COAST 2.5 2.4 2.3 2.2 2.2 2.0 2.0 NORTH COAST 2.4 3.2 3.4 3.3 3.1 NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 12.9 10.7 9.6 9.3 8.5 7.7 7.3 SACRAMENTO VALLEY 12.9 10.7 9.6 9.3 8.5 7.7 7.3 SALTON SEA 2.2 2.1 17.4 18.8 17.8 17.4 15.5 

SAN DIEGO 8.6 7.8 7.7 7.3 7.3 6.3 6.3 SAN FRANCISCO BAY AREA 11.1 9.3 8.1 7.8 7.4 6.5 6.7 SAN JOAQUIN VALLEY 11.5 10.0 10.0 10.9 9.9 9.0 8.3 SOUTH CENTRAL COAST 6.4 5.5 5.9 6.0 5.8 5.0 4.8 SOUTH COAST 17.7 16.5 16.7 15.6 16.1 15.5 15.4 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Carbon MonoxideMaximum 8-Hour Concentration (ppm)Maximum 1-Hour Concentration (ppm)

Table A-11 Table A-12 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 11.0 13.0 9.0 10.0 6.0 8.2 6.7 

LAKE COUNTYLAKE TAHOE 15.0 13.0 11.6 9.5 10.4 7.7 7.5 

MOJAVE DESERT 9.0 8.0 9.1 7.5 8.4 5.9 5.4 MOUNTAIN COUNTIES 6.2 10.0 9.3 9.3 4.5 6.6 6.7 NORTH CENTRAL COAST 4.0 4.0 4.6 3.2 5.5 4.4 3.8 NORTH COAST 1.0 6.0 5.4 4.8 7.4 4.8 NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 12.0 12.0 10.8 9.8 8.7 9.5 7.9 SACRAMENTO VALLEY 14.0 12.0 10.8 9.8 8.7 9.5 7.9 SALTON SEA 5.0 6.0 30.6 32.0 27.0 24.0 23.5 

SAN DIEGO 14.0 11.4 11.0 9.9 12.4 9.3 10.2 SAN FRANCISCO BAY AREA 12.0 14.0 12.0 10.1 8.8 10.7 8.7 SAN JOAQUIN VALLEY 13.0 13.0 15.0 12.0 11.0 9.9 10.3 SOUTH CENTRAL COAST 12.0 9.0 10.7 8.9 12.6 8.2 8.5 SOUTH COAST 28.0 21.0 24.9 16.8 22.5 19.2 17.0 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 4.4 4.5 5.4 5.4 3.0 3.4 3.0 LAKE COUNTYLAKE TAHOE 9.9 7.5 7.1 6.3 5.1 3.8 4.3 MOJAVE DESERT 5.4 5.9 5.6 5.1 7.5 4.0 3.6 MOUNTAIN COUNTIES 4.5 5.4 5.4 3.4 2.6 1.9 5.5 NORTH CENTRAL COAST 2.9 2.7 2.1 2.1 2.6 1.8 2.2 NORTH COAST 0.6 2.4 3.2 2.7 3.2 3.5 NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 8.6 9.4 8.5 7.4 7.2 7.2 7.1 SACRAMENTO VALLEY 8.6 9.4 8.5 7.4 7.2 7.2 7.1 SALTON SEA 2.4 2.0 13.1 22.9 22.1 17.8 14.4 

SAN DIEGO 7.9 7.5 7.5 6.3 7.1 5.4 4.8 SAN FRANCISCO BAY AREA 7.8 7.9 8.8 5.8 7.0 6.1 6.3 SAN JOAQUIN VALLEY 8.3 9.3 8.9 9.1 7.7 7.5 8.0 SOUTH CENTRAL COAST 5.9 4.8 6.5 5.8 4.9 4.1 4.6 SOUTH COAST 18.8 14.6 18.2 13.8 17.5 17.1 13.3 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Carbon MonoxideDays Above National 8-Hour StandardTable A-13 AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYS 0 000000 LAKE COUNTYLAKE TAHOE 1 000000MOJAVE DESERT 0 000000MOUNTAIN COUNTIES 0 000000

NORTH CENTRAL COAST 0 000000

NORTH COAST 0 0 0000NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 0 000000SACRAMENTO VALLEY 0 000000

SALTON SEA 0 0 9 15 9 10 8 SAN DIEGO 0 000000SAN FRANCISCO BAY AREA 0 000000

SAN JOAQUIN VALLEY 0 000000

SOUTH CENTRAL COAST 0 000000

SOUTH COAST 34 19 19 14 19 13 10

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

1-Hour Design Value (ppb)Nitrogen DioxideMaximum 1-Hour Concentration (ppb)

Table A-14 Table A-15 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYSLAKE COUNTYLAKE TAHOE 60.0 60.0 57.0 59.0 61.0 51.0 52.0 

MOJAVE DESERT 240.0 360.0 138.0 140.0 87.0 107.0 196.0 1MOUNTAIN COUNTIES 

NORTH CENTRAL COAST 70.0 70.0 67.0 54.0 60.0 56.0 85.0 NORTH COAST 80.0 50.0 79.0 78.0 44.0 61.0 52.0 

NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 190.0 120.0 111.0 99.0 145.0 92.0 101.0 1SACRAMENTO VALLEY 190.0 120.0 111.0 99.0 145.0 92.0 101.0 1SALTON SEA 90.0 90.0 227.0 217.0 164.0 128.0 257.0 2SAN DIEGO 190.0 130.0 157.0 140.0 124.0 142.0 132.0 1SAN FRANCISCO BAY AREA 110.0 120.0 107.0 116.0 108.0 118.0 98.0 1SAN JOAQUIN VALLEY 190.0 160.0 144.0 119.0 110.0 103.0 112.0 1SOUTH CENTRAL COAST 100.0 110.0 133.0 127.0 110.0 115.0 97.0 SOUTH COAST 300.0 260.0 247.0 239.0 250.0 200.0 255.0 3

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYSLAKE COUNTYLAKE TAHOE 48 47 47 47 MOJAVE DESERT 60 73 85 83 78 77 81 

MOUNTAIN COUNTIESNORTH CENTRAL COAST 50 50 49 48 45 45 43 NORTH COAST 

NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 90 90 83 80 78 75 72 SACRAMENTO VALLEY 90 90 83 80 78 75 72 SALTON SEA 71 69 113 62 SAN DIEGO 120 109 104 99 95 94 88 SAN FRANCISCO BAY AREA 110 97 85 90 87 84 78 SAN JOAQUIN VALLEY 100 97 95 97 89 84 78 SOUTH CENTRAL COAST 87 84 84 89 74 82 73 SOUTH COAST 223 190 171 168 151 138 127 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Annual Average Design Value (ppb)Nitrogen DioxideTable A-16 AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYSLAKE COUNTYLAKE TAHOE 11 11 12 11 11 11 10 MOJAVE DESERT 26 26 27 23 21 20 22 

MOUNTAIN COUNTIES 

NORTH CENTRAL COAST 12 12 12 11 11 10 10 

NORTH COAST 9 9 10 10 

NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 21 22 22 22 22 19 21 SACRAMENTO VALLEY 21 22 22 22 22 19 21 SALTON SEA 19 21 21 20 15 16 SAN DIEGO 27 23 24 26 22 24 23 SAN FRANCISCO BAY AREA 25 27 28 27 25 25 25 SAN JOAQUIN VALLEY 27 27 24 29 29 24 24 SOUTH CENTRAL COAST 22 23 24 24 22 20 21 SOUTH COAST 51 50 50 46 42 43 43 

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Sulfur DioxideMaximum 1-Hour Concentration (ppb)1-Hour Design Value (ppb)Table A-17 Table A-18 AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYSLAKE COUNTYLAKE TAHOEMOJAVE DESERT 30.0 30.0 67.0 15.0 16.0 35.0 13.0 MOUNTAIN COUNTIESNORTH CENTRAL COAST 10.0 50.0 41.0 58.0 9.0 6.0 28.0 NORTH COAST 30.0 10.0 9.0 

NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 20.0 40.0 30.0 14.0 14.0 38.0 29.0 SACRAMENTO VALLEY 20.0 40.0 30.0 14.0 14.0 38.0 29.0 SALTON SEA 60.0 39.0 36.0 40.0 35.0 SAN DIEGO 120.0 56.0 98.0 81.0 87.0 81.0 149.0 SAN FRANCISCO BAY AREA 100.0 110.0 74.0 47.0 63.0 99.0 62.0 SAN JOAQUIN VALLEY 30.0 30.0 29.0 26.0 59.0 20.0 SOUTH CENTRAL COAST 170.0 570.0 95.0 245.0 251.0 211.0 162.0 1SOUTH COAST 150.0 90.0 40.0 138.0 61.0 96.0 90.0 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYSLAKE COUNTYLAKE TAHOEMOJAVE DESERT 10 10 9 8 10 9 MOUNTAIN COUNTIESNORTH CENTRAL COAST 10 15 6 

NORTH COAST 

NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 17 13 10 0 0 0 12 SACRAMENTO VALLEY 17 13 10 12 

SALTON SEA 28 SAN DIEGO 50 70 72 55 56 56 56 SAN FRANCISCO BAY AREA 37 37 40 28 27 30 36 SAN JOAQUIN VALLEY 23 20 15 13 14 SOUTH CENTRAL COAST 103 100 23 25 21 126 130 SOUTH COAST 57 63 56 43 41 41 33 

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ARB Almanac 2013 – Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM2.5, CO

Maximum 24-Hour Concentration (ppb)Maximum Annual Average (ppb)Sulfur Dioxide

Table A-19 Table A-20 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYSLAKE COUNTYLAKE TAHOEMOJAVE DESERT 12.2 10.4 11.7 8.3 6.8 7.0 6.1 MOUNTAIN COUNTIESNORTH CENTRAL COAST 8.3 6.7 6.0 12.2 3.2 2.0 3.9 NORTH COAST 6.4 1.4 2.3 

NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 12.2 6.5 11.0 7.0 6.4 6.2 18.4 SACRAMENTO VALLEY 12.2 6.5 11.0 7.0 6.4 6.2 18.4 SALTON SEA 17.7 17.3 14.2 14.1 18.6 SAN DIEGO 30.0 18.0 19.5 17.5 19.2 16.7 20.2 SAN FRANCISCO BAY AREA 20.8 12.5 9.9 9.9 13.0 13.5 14.3 SAN JOAQUIN VALLEY 10.0 10.4 10.7 14.8 13.1 5.3 SOUTH CENTRAL COAST 21.7 38.3 7.3 36.7 29.2 30.4 30.3 SOUTH COAST 32.6 13.9 9.8 17.9 11.9 13.9 12.3 

AIR BASIN 1992 1993 1994 1995 1996 1997 1998 1GREAT BASIN VALLEYSLAKE COUNTYLAKE TAHOEMOJAVE DESERT 2.5 3.4 4.1 3.2 1.6 1.5 1.2 MOUNTAIN COUNTIESNORTH CENTRAL COAST 0.1 0.4 1.7 0.6 1.3 0.5 1.0 NORTH COAST 0.4 0.0 0.9 

NORTHEAST PLATEAUSACRAMENTO METROPOLITAN AREA 0.8 0.4 1.3 1.3 2.1 2.3 3.2 SACRAMENTO VALLEY 0.8 0.4 1.3 1.3 2.1 2.3 3.2 SALTON SEA 6.6 5.2 3.8 2.6 3.4 

SAN DIEGO 4.4 2.8 3.0 3.5 4.7 4.0 3.2 SAN FRANCISCO BAY AREA 1.9 1.6 2.3 2.8 2.7 3.4 2.5 SAN JOAQUIN VALLEY 2.1 2.4 3.9 3.7 2.7 2.0 SOUTH CENTRAL COAST 3.2 4.0 2.2 5.8 5.0 4.0 4.5 SOUTH COAST 5.7 3.6 4.1 3.9 3.6 3.5 4.0 

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