SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: THU., DEC. 04, 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 36 32 0.7 30 11 43 55 2 NW Coastal LA 39 35 0.5 27 10 33 53 3 SW Coastal LA 39 34 0.7 28 14 40 60 4 S Coastal LA 38 32 1.3 32 14 47 60 5 Southeast LA Co 38 32 2.1 33 13 43 58 6 W San Fernando Vly 42 38 1.0 24 6 29 35 7 E San Fernando Vly 40 35 0.9 29 8 40 44 8 W San Gabriel Vly 36 34 0.6 28 7 41 39 9 E San Gabriel Vly 41 37 0.4 10 1 25 34 10 Pomona Walnut Vly 41 36 0.8 29 6 39 37 11 S San Gabriel Vly 37 31 0.9 31 9 39 50 12 S Central LA Co 38 33 2.1 30 17 39 66 13 Santa Clarita Vly 45 42 0.3 25 6 19 39 15 San Gabriel Mts 41 39 0.6 28 5 36 36 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 40 35 0.5 24 6 32 33 Orange County: South Coast Air Basin 16 N Orange Co 41 35 0.8 34 9 32 50 17 Central Orange Co 38 34 0.9 34 9 37 50 18 N Coastal Orange Co 35 30 1.1 30 12 43 56 19 Saddleback Vly 40 37 0.5 29 7 35 39 20 Central Coastal 38 34 0.7 24 9 32 50 21 Capistrano Vly 40 37 0.4 17 8 26 44 Riverside County: South Coast Air Basin 22 Norco/Corona 41 36 0.9 31 7 36 39 23 Metro Riverside Co 42 38 0.9 32 6 36 35 24 Perris Vly 41 37 0.8 22 4 30 34 25 Lake Elsinore 44 41 0.4 12 3 22 38 26 Temecula Vly 44 40 0.3 16 2 21 37 27 Anza Vly 44 42 0.3 19 3 21 39 28 Hemet/San Jacinto 43 41 0.6 19 2 30 38 29 Banning 44 42 0.6 17 3 31 39 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 45 42 0.2 36 9 21 50 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 39 36 0.2 20 5 19 33 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 51 47 0.5 23 5 34 44 33 SW San Bernardino Vly 42 37 0.9 31 7 38 39 34 C San Bernardino Vly 40 36 0.9 23 3 37 35 35 E San Bernardino Vly 41 38 0.8 24 3 31 35 36 W San Bernardino Mtns 46 43 0.7 23 4 34 40 37 C San Bernardino Mtns 44 39 0.8 24 4 32 36 38 Big Bear Lake 47 45 0.7 21 8 31 44 San Bernardino County: Mojave Desert Air Basin 39 Phelan 48 47 0.6 24 6 33 44 40 Hesperia 40 35 0.7 26 7 33 39 41 Trona 38 31 0.3 15 2 15 29 42 Victorville 42 37 0.6 25 9 33 50 43 Yucca Vly 43 42 0.4 24 7 26 39 44 Barstow 45 34 0.5 21 6 40 38 45 Twentynine Palms 40 38 0.3 24 6 24 35 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON THU., DEC. 04, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 33 PM2.5 Banning Pass Area AQI: 39 Ozone Big Bear Lake AQI: 44 PM2.5 Central Mojave Desert AQI: 39 PM2.5 Coachella Valley/Low Desert AQI: 50 PM2.5 Hemet/Elsinore Area AQI: 38 Ozone Inland Orange County AQI: 50 PM2.5 Northern Mojave Desert AQI: 38 NO2 Riverside Valley AQI: 39 PM2.5 San Bernardino Mountains AQI: 40 Ozone San Bernardino Valley AQI: 44 Ozone San Fernando/Santa Clarita Valleys AQI: 44 PM2.5 San Gabriel Mountains AQI: 36 Ozone San Gabriel Valley AQI: 50 PM2.5 Temecula/Anza Area AQI: 39 Ozone Victor Valley AQI: 50 PM2.5 MODERATE in the following area(s): Coastal Area AQI: 60 PM2.5 Metropolitan Area AQI: 66 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Santa Ana winds on Thursday. Inversion Base: 486 FT | Breaking Temperature: 61 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2629 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 04, 2025 IN THE SOUTH COAST AIR BASIN.