SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: THU., DEC. 11, 2025 -------------------------------------------------------------------------------- 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 40 29 0.8 29 19 43 69 2 NW Coastal LA 41 33 0.9 26 18 40 68 3 SW Coastal LA 38 32 1.0 27 17 41 66 4 S Coastal LA 32 25 1.3 29 16 46 64 5 Southeast LA Co 40 26 1.7 29 19 52 69 6 W San Fernando Vly 44 36 1.6 24 15 44 62 7 E San Fernando Vly 41 32 1.3 29 14 43 60 8 W San Gabriel Vly 43 36 0.8 29 12 43 56 9 E San Gabriel Vly 43 37 0.7 16 7 52 49 10 Pomona Walnut Vly 42 32 0.8 33 14 46 60 11 S San Gabriel Vly 38 26 1.1 29 17 52 66 12 S Central LA Co 47 30 1.7 28 18 37 68 13 Santa Clarita Vly 44 38 0.4 27 9 24 50 15 San Gabriel Mts 43 37 0.9 30 8 45 44 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 39 30 0.6 31 12 35 56 Orange County: South Coast Air Basin 16 N Orange Co 39 25 0.9 38 20 40 71 17 Central Orange Co 38 24 1.5 30 23 45 77 18 N Coastal Orange Co 30 21 1.2 28 23 44 77 19 Saddleback Vly 46 35 0.5 38 18 43 68 20 Central Coastal 36 26 0.7 27 22 36 75 21 Capistrano Vly 40 31 0.5 25 20 31 71 Riverside County: South Coast Air Basin 22 Norco/Corona 47 35 1.2 50 16 45 64 23 Metro Riverside Co 48 36 1.3 57 17 48 66 24 Perris Vly 43 36 0.9 37 8 42 44 25 Lake Elsinore 49 43 0.5 20 7 29 40 26 Temecula Vly 48 42 0.5 21 2 27 39 27 Anza Vly 48 43 0.4 23 2 27 40 28 Hemet/San Jacinto 47 41 0.8 30 4 41 39 29 Banning 46 43 0.8 26 4 43 41 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 47 42 0.3 37 4 27 39 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 36 31 0.3 22 2 21 29 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 52 42 0.7 23 10 40 53 33 SW San Bernardino Vly 43 31 1.2 50 16 46 64 34 C San Bernardino Vly 44 35 1.1 39 9 47 50 35 E San Bernardino Vly 45 37 1.0 40 6 44 42 36 W San Bernardino Mtns 47 40 0.9 29 6 42 40 37 C San Bernardino Mtns 43 37 1.0 37 7 40 39 38 Big Bear Lake 50 46 1.0 32 12 40 56 San Bernardino County: Mojave Desert Air Basin 39 Phelan 42 40 0.8 28 6 38 37 40 Hesperia 37 31 0.9 30 9 39 50 41 Trona 31 23 0.4 22 2 14 21 42 Victorville 41 33 0.8 29 12 38 56 43 Yucca Vly 46 43 0.5 26 2 31 40 44 Barstow 33 21 0.6 24 5 43 41 45 Twentynine Palms 39 35 0.4 25 2 28 32 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON THU., DEC. 11, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 41 NO2 Central Mojave Desert AQI: 40 Ozone Coachella Valley/Low Desert AQI: 39 Ozone Hemet/Elsinore Area AQI: 44 PM2.5 Northern Mojave Desert AQI: 41 NO2 San Bernardino Mountains AQI: 40 NO2 San Gabriel Mountains AQI: 44 PM2.5 Temecula/Anza Area AQI: 40 Ozone MODERATE in the following area(s): Antelope Valley AQI: 56 PM2.5 Big Bear Lake AQI: 56 PM2.5 Coastal Area AQI: 77 PM2.5 Inland Orange County AQI: 77 PM2.5 Metropolitan Area AQI: 71 PM2.5 Riverside Valley AQI: 66 PM2.5 San Bernardino Valley AQI: 64 PM2.5 San Fernando/Santa Clarita Valleys AQI: 62 PM2.5 San Gabriel Valley AQI: 66 PM2.5 Victor Valley AQI: 56 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Mostly sunny skies and cooler temperatures are expected, with patchy morning fog along the coast. Inversion Base: 486 FT | Breaking Temperature: 72 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2038 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 THURSDAY, DECEMBER 11, 2025 IN THE SOUTH COAST AIR BASIN.