SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SAT., SEP. 12, 2026 -------------------------------------------------------------------------------- SRA AREA 1-HR 8-HR 8-HR 24-HR 24-HR 1-HR MAX NUMBER OZONE OZONE CO PM10 PM2.5 NO2 AQI PPB PPB PPM UG/M3 UG/M3 PPB -------------------------------------------------------------------------------- Los Angeles County: South Coast Air Basin 1 Central LA Co 65 54 0.7 29 12 15 56 2 NW Coastal LA 48 41 0.4 28 10 10 53 3 SW Coastal LA 44 37 0.2 30 9 16 50 4 S Coastal LA 48 44 0.3 35 9 13 50 5 Southeast LA Co 55 50 0.5 36 11 17 55 6 W San Fernando Vly 57 50 0.4 26 9 9 50 7 E San Fernando Vly 72 61 0.5 29 12 15 71 8 W San Gabriel Vly 78 64 0.4 33 13 13 80 9 E San Gabriel Vly 74 67 0.4 37 11 17 90 10 Pomona Walnut Vly 76 68 0.4 41 12 21 93 11 S San Gabriel Vly 61 55 0.4 37 12 17 56 12 S Central LA Co 55 49 0.3 32 10 9 53 13 Santa Clarita Vly 71 63 0.3 25 12 16 77 15 San Gabriel Mts 68 62 0.4 37 12 18 74 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 59 53 0.3 21 11 14 55 Orange County: South Coast Air Basin 16 N Orange Co 52 48 0.2 42 11 11 55 17 Central Orange Co 50 44 0.3 37 10 7 53 18 N Coastal Orange Co 43 40 0.3 34 6 12 37 19 Saddleback Vly 52 45 0.2 42 5 12 42 20 Central Coastal 47 42 0.3 32 6 11 39 21 Capistrano Vly 47 41 0.3 32 8 12 44 Riverside County: South Coast Air Basin 22 Norco/Corona 67 56 0.4 51 10 14 54 23 Metro Riverside Co 76 64 0.5 56 13 13 80 24 Perris Vly 58 55 0.4 38 10 20 53 25 Lake Elsinore 56 48 0.3 26 8 12 44 26 Temecula Vly 49 42 0.3 40 9 12 50 27 Anza Vly 50 43 0.3 45 5 12 42 28 Hemet/San Jacinto 55 50 0.3 35 8 21 46 29 Banning 58 55 0.3 32 7 18 51 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- SRA AREA 1-HR 8-HR 8-HR 24-HR 24-HR 1-HR MAX NUMBER OZONE OZONE CO PM10 PM2.5 NO2 AQI PPB PPB PPM UG/M3 UG/M3 PPB -------------------------------------------------------------------------------- Riverside County: Salton Sea Air Basin 30 Coachella Vly 58 53 0.3 56 7 12 51 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 44 40 0.2 37 5 11 37 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 73 69 0.4 35 14 18 97 33 SW San Bernardino Vly 71 63 0.4 51 12 23 77 34 C San Bernardino Vly 74 67 0.4 39 12 27 90 35 E San Bernardino Vly 74 69 0.4 40 10 22 97 36 W San Bernardino Mtns 69 66 0.4 35 12 24 87 37 C San Bernardino Mtns 72 64 0.3 38 7 26 80 38 Big Bear Lake 57 53 0.3 35 5 24 49 San Bernardino County: Mojave Desert Air Basin 39 Phelan 63 61 0.3 30 6 25 71 40 Hesperia 57 54 0.3 29 8 28 50 41 Trona 51 49 0.2 37 5 22 45 42 Victorville 60 56 0.3 30 9 27 54 43 Yucca Vly 61 52 0.3 36 5 20 48 44 Barstow 63 60 0.3 33 7 40 67 45 Twentynine Palms 54 50 0.2 36 7 18 46 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SAT., SEP. 12, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Big Bear Lake AQI: 49 Ozone Central Mojave Desert AQI: 48 Ozone Temecula/Anza Area AQI: 50 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 55 PM2.5 Banning Pass Area AQI: 51 Ozone Coachella Valley/Low Desert AQI: 51 PM10 Coastal Area AQI: 53 PM2.5 Hemet/Elsinore Area AQI: 53 PM2.5 Inland Orange County AQI: 53 PM2.5 Metropolitan Area AQI: 56 PM2.5 Northern Mojave Desert AQI: 67 Ozone Riverside Valley AQI: 80 Ozone San Bernardino Mountains AQI: 87 Ozone San Bernardino Valley AQI: 97 Ozone San Fernando/Santa Clarita Valleys AQI: 77 Ozone San Gabriel Mountains AQI: 74 Ozone San Gabriel Valley AQI: 93 Ozone Victor Valley AQI: 71 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Saturday temperatures will be 2-4 degrees cooler than Friday but still slightly above normal. Humidity will remain higher than normal but with a slight reduction from Friday. Skies will be partly cloudy becoming mostly sunny and winds will gust to 30 mph, particularly in the deserts. Inversion Base: 1514 FT | Breaking Temperature: 87 DEG F Inversion Breaking: NO | Maximum Mixing HEIGHT: 2196 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: BURN Area 53 - Mojave Desert Air Basin: BURN Area 55 - Salton Sea Air Basin: BURN Beach Fire Ring Wood Burning: Allowed in All Areas Residential Wood Burning: Allowed in All Areas Coachella Valley Rule 403.1 Wind Forecast: Winds Below 25 MPH ------------------------------------------------------------------------ ATTENTION ALL SCHOOLS AND INDUSTRIES THIS IS THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT NO AIR POLLUTION OR HEALTH ADVISIORY EPISODES ARE PREDICTED FOR SATURDAY, SEPTEMBER 12, 2026 IN THE SOUTH COAST AIR BASIN.