SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., DEC. 24, 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 36 0.6 16 7 21 39 2 NW Coastal LA 38 35 0.4 15 7 17 39 3 SW Coastal LA 37 32 0.3 16 9 21 50 4 S Coastal LA 41 35 0.4 16 9 30 50 5 Southeast LA Co 37 33 0.6 17 9 28 50 6 W San Fernando Vly 41 39 0.4 14 6 17 36 7 E San Fernando Vly 36 35 0.5 16 6 18 33 8 W San Gabriel Vly 39 38 0.2 16 5 13 35 9 E San Gabriel Vly 42 35 0.3 14 2 17 32 10 Pomona Walnut Vly 40 34 0.4 19 6 23 33 11 S San Gabriel Vly 35 34 0.4 16 7 24 39 12 S Central LA Co 39 34 0.6 16 9 26 50 13 Santa Clarita Vly 40 38 0.2 13 6 7 35 15 San Gabriel Mts 42 39 0.3 17 4 18 36 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 48 42 0.2 10 5 21 39 Orange County: South Coast Air Basin 16 N Orange Co 35 32 0.2 19 7 15 39 17 Central Orange Co 39 34 0.5 17 7 23 39 18 N Coastal Orange Co 43 37 0.4 16 7 27 39 19 Saddleback Vly 46 41 0.2 19 5 19 38 20 Central Coastal 46 40 0.2 13 5 16 37 21 Capistrano Vly 48 42 0.2 11 3 10 39 Riverside County: South Coast Air Basin 22 Norco/Corona 43 38 0.3 23 6 18 35 23 Metro Riverside Co 43 37 0.5 25 7 19 39 24 Perris Vly 43 38 0.4 20 3 16 35 25 Lake Elsinore 48 40 0.2 9 2 6 37 26 Temecula Vly 47 36 0.2 12 2 9 33 27 Anza Vly 50 38 0.2 14 4 12 35 28 Hemet/San Jacinto 48 39 0.3 18 3 14 36 29 Banning 52 42 0.3 16 4 13 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 43 40 0.2 22 8 16 44 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 36 33 0.2 15 7 11 39 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 49 42 0.4 20 7 15 39 33 SW San Bernardino Vly 40 35 0.4 23 7 21 39 34 C San Bernardino Vly 38 33 0.3 23 5 21 31 35 E San Bernardino Vly 44 37 0.4 21 4 17 34 36 W San Bernardino Mtns 46 41 0.3 18 5 17 38 37 C San Bernardino Mtns 54 45 0.3 21 4 17 42 38 Big Bear Lake 49 42 0.3 19 7 21 39 San Bernardino County: Mojave Desert Air Basin 39 Phelan 52 50 0.3 13 2 16 46 40 Hesperia 45 42 0.3 12 3 17 39 41 Trona 47 40 0.2 16 3 11 37 42 Victorville 48 46 0.3 12 1 15 43 43 Yucca Vly 48 45 0.2 17 7 19 42 44 Barstow 50 41 0.2 13 3 30 38 45 Twentynine Palms 35 33 0.2 16 6 17 33 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., DEC. 24, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 39 Ozone Banning Pass Area AQI: 39 Ozone Big Bear Lake AQI: 39 PM2.5 Central Mojave Desert AQI: 42 Ozone Coachella Valley/Low Desert AQI: 44 PM2.5 Coastal Area AQI: 50 PM2.5 Hemet/Elsinore Area AQI: 37 Ozone Inland Orange County AQI: 39 PM2.5 Metropolitan Area AQI: 50 PM2.5 Northern Mojave Desert AQI: 38 Ozone Riverside Valley AQI: 39 PM2.5 San Bernardino Mountains AQI: 42 Ozone San Bernardino Valley AQI: 39 PM2.5 San Fernando/Santa Clarita Valleys AQI: 36 Ozone San Gabriel Mountains AQI: 36 Ozone San Gabriel Valley AQI: 39 PM2.5 Temecula/Anza Area AQI: 35 Ozone Victor Valley AQI: 46 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Heavy rain is expected throughout the region on Wednesday, which will result in good air quality conditions. The NWS has issued flood watches and high wind warnings throughout the area. See www.weather.gov/SGX and www.weather.gov/LOX for details. Inversion Base: 11547 FT | Breaking Temperature: 92 DEG F Inversion Breaking: NO | Maximum Mixing HEIGHT: 1006 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 WEDNESDAY, DECEMBER 24, 2025 IN THE SOUTH COAST AIR BASIN.