Site Name AIRS Site ID High 24-Hour Concentration ug/m3 *Average of Quarters ug/m3 *Valid? †Number of Months †Number of Quarters ‡Number of Observations Bay Area AQMD Concord-2975 Treat Blvd 60130002 55.4 11.7 No 10 4 105 Fremont-Chapel Way 60011001 56.5 13.9 No 12 4 76 Livermore-793 Rincon Avenue 60010007 63.1 28 No 1 1 8 Redwood City 60811001 59.7 12.1 No 11 4 68 San Francisco-Arkansas Street 60750005 71.2 12.6 No 11 4 121 San Jose-Tully Road 60852003 77 14.5 No 10 4 117 San Jose-4th Street 60850004 69.3 12 No 10 4 117 Santa Rosa-5th Street 60970003 54.9 11.7 No 12 4 69 Vallejo-304 Tuolumne Street 60950004 90.5 14.1 No 10 4 63 Coachella Valley Indio-Jackson Street 60652002 29.6 12.8 No 10 4 83 Palm Springs-Fire Station (opened 1/00) 60655001 No 0 0 0 Great Basin Unified APCD Keeler-Cerro Gordo Road 60271003 40.7 7.2 No 10 4 69 Mammoth Lakes-Gateway HC (opened 6/00) 60510001 No 0 0 0 Imperial County APCD Brawley-Main Street 60250003 44.2 10.8 No 9 4 70 Calexico-Ethel Street 60250005 51.6 15.2 Yes 12 4 107 El Centro-9th Street 60251003 52.5 11.5 No 12 4 109 Lake County Air Basin Lakeport-Lakeport Blvd 60333001 14.5 4.4 No 12 4 47 Site Name AIRS Site ID High 24-Hour Concentration ug/m3 *Average of Quarters ug/m3 *Valid? †Number of Months †Number of Quarters ‡Number of Observations Lake Tahoe Air Basin Echo Summit (opened 1/00) 60170012 No 0 0 0 North Lake Tahoe (planned site) TBD No 0 0 0 South Lake Tahoe-Sandy Way 60170011 21 8.3 Yes 12 4 59 Mojave Desert Air Basin Lancaster-W Pondera Street 60379002 25.5 10.8 Yes 12 4 112 Mojave-923 Poole Street 60290011 15.8 8.3 No 10 4 89 Ridgecrest-Las Flores Avenue 60290012 22.9 8.5 No 7 3 46 Victorville-Armagosa Road 60710014 24.3 11.8 Yes 12 4 112 Monterey Bay Unified APCD Salinas-Natividad Road #2 60531002 17 8.1 No 8 3 61 Santa Cruz-2544 Soquel Avenue 60870007 31.4 9.4 No 6 3 52 Mountain Counties Air Basin Grass Valley-Litton Building 60570005 31 7.6 No 12 4 52 Portola-Commercial Street 60631008 70 13.9 No 10 4 73 Quincy-N Church Street 60631006 92 13.3 No 10 4 73 San Andreas-Gold Strike Road 60090001 33 11.1 Yes 12 4 59 Truckee-Fire Station 60571001 50 9 No 8 4 46 Site Name AIRS Site ID High 24-Hour Concentration ug/m3 *Average of Quarters ug/m3 *Valid? †Number of Months †Number of Quarters ‡Number of Observations North Coast Air Basin Eureka-Health Dept 6th and I Street 60231002 36.9 9 Yes 12 4 58 Ukiah-County Library 60450006 35.6 8.7 Yes 12 4 58 Northeast Plateau Air Basin Alturas-W 4th Street 60490001 40 7.9 Yes 12 4 56 Sacramento Valley Air Basin Chico-Manzanita Avenue 60070002 73 17.5 Yes 12 4 59 Colusa-Sunrise Blvd 60111002 55 13.2 No 12 4 85 Redding-Health Dept Roof 60890004 57 12.9 Yes 12 4 57 Roseville-N Sunrise Blvd 60610006 79 13.4 Yes 12 4 59 Sacramento-Del Paso Manor 60670006 86 23.7 No 7 3 66 Sacramento-Health Dept Stockton Blvd 60674001 86 16.2 Yes 11 4 158 Sacramento-T Street 60670010 108 17 Yes 12 4 264 Woodland-Gibson Road 61131003 70 16.3 Yes 11 4 98 Yuba City-Almond Street 61010003 58 15.9 Yes 12 4 58 San Diego County APCD Chula Vista 60730001 47.1 15.2 Yes 12 4 102 El Cajon-Redwood Avenue 60730003 63.9 16.6 Yes 12 4 319 Escondido-E Valley Parkway 60731002 56.8 17.6 Yes 12 4 248 San Diego-Overland Avenue 60730006 43.5 13.7 Yes 12 4 99 San Diego-12th Avenue 60731007 46.4 17.4 Yes 12 4 290 Site Name AIRS Site ID High 24-Hour Concentration ug/m3 *Average of Quarters ug/m3 *Valid? †Number of Months †Number of Quarters ‡Number of Observations San Joaquin Valley Unified APCD Bakersfield-Golden State Highway 60290014 133.9 26.2 Yes 12 4 84 Bakersfield-Southeast (opened 2/00) 60290016 No 0 0 0 Bakersfield-5558 California Avenue 60290010 134.8 31.2 Yes 12 4 294 Clovis-N Villa Avenue 60195001 97.7 19.8 Yes 12 4 82 Corcoran-Patterson Avenue 60310004 113.5 23.1 Yes 12 4 79 Fresno-Hamilton & Winery (opened 1/00) 60195025 No 0 0 0 Fresno-1st Street 60190008 136 27.7 Yes 12 4 275 Merced-2334 M Street 60472510 108.7 22.6 No 9 3 53 Modesto-14th Street 60990005 108 24.9 Yes 12 4 117 Stockton-Hazelton Street 60771002 101 19.7 Yes 12 4 117 Visalia-N Church Street 61072002 123 27.6 Yes 12 4 117 San Luis Obispo County APCD Atascadero-Lewis Avenue 60798001 27.5 9.6 Yes 12 4 59 San Luis Obispo-Marsh Street 60792002 20 8.2 Yes 12 4 54 Santa Barbara County APCD Santa Barbara-W Carillo Street 60830010 31 13.4 Yes 12 4 56 Santa Maria-Broadway 60831007 19.3 10.2 No 3 1 14 Site Name AIRS Site ID High 24-Hour Concentration ug/m3 *Average of Quarters ug/m3 *Valid? †Number of Months †Number of Quarters ‡Number of Observations South Coast Air Basin Anaheim-Harbor Blvd 60590001 68.6 25.9 No 8 4 92 Azusa 60370002 81.3 25 Yes 12 4 144 Big Bear City-501 W. Valley Blvd 60718001 32.1 10.3 Yes 11 4 97 Burbank-W Palm Avenue 60371002 79.4 22.9 Yes 12 4 106 Fontana-Arrow Highway 60712002 97.9 25.7 Yes 12 4 121 Los Angeles-North Main Street 60371103 69.3 23 Yes 12 4 136 Lynwood 60371301 67.7 24.3 Yes 12 4 110 Mission Viejo-26081 Via Pera 60592022 56.6 17 No 7 3 65 North Long Beach 60374002 66.9 20.7 Yes 12 4 148 Ontario-1408 Francis Street 60710025 85.8 25.4 Yes 12 4 96 Pasadena-S Wilson Avenue 60372005 73 19.9 No 10 4 95 Pico Rivera 60371601 85.6 25.7 Yes 12 4 111 Reseda 60371201 79 17.3 Yes 10 4 71 Riverside-Magnolia 60651003 89.9 26.7 Yes 12 4 110 Riverside-Rubidoux 60658001 111.2 31 Yes 12 4 137 San Bernardino-4th Street 60719004 121.4 25.6 Yes 12 4 104 Ventura County APCD El Rio-Rio Mesa School #2 61113001 36.7 12.2 No 12 4 92 Piru-Pacific Avenue (to open 8/00) 61110004 No 0 0 0 Simi Valley-Cochran Street 61112002 64.6 13.8 Yes 12 4 109 Thousand Oaks-Moorpark Road 61110007 53.2 11.8 Yes 12 4 110 "* Average of Quarters and Valid? are calculated according to the methods specified in 40 CFR Part 50, Appendix N. Typically, a year is complete, and the Average of Quarters is therefore valid, if 75% or more of the expected measurements are available in each quarter. Under certain circumstances, however, an Average of Quarters can be deemed valid with fewer measurements (see 40 CFR Part 50, Appendix N for details)." "† Number of Months and Number of Quarters are the number of months and number of quarters, respectively, that include at least one measurement." ‡ Number of Observations is the total number of 24-hour measurements represented at each site.