SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., NOV. 21, 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 37 35 0.5 18 9 27 50 2 NW Coastal LA 35 33 0.5 15 6 22 33 3 SW Coastal LA 39 36 0.3 16 7 34 39 4 S Coastal LA 41 38 0.6 15 9 36 50 5 Southeast LA Co 39 36 0.6 16 8 33 44 6 W San Fernando Vly 40 39 0.9 13 5 23 36 7 E San Fernando Vly 37 36 0.7 17 7 25 39 8 W San Gabriel Vly 40 38 0.3 16 6 24 35 9 E San Gabriel Vly 42 40 0.3 11 2 19 37 10 Pomona Walnut Vly 39 35 0.3 14 5 27 32 11 S San Gabriel Vly 40 38 0.6 16 7 24 39 12 S Central LA Co 38 35 0.4 16 9 30 50 13 Santa Clarita Vly 42 39 0.3 12 6 17 36 15 San Gabriel Mts 39 37 0.5 15 5 23 34 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 42 39 0.2 12 7 22 39 Orange County: South Coast Air Basin 16 N Orange Co 38 36 0.3 12 7 14 39 17 Central Orange Co 35 33 0.5 10 7 32 39 18 N Coastal Orange Co 43 40 0.5 11 6 34 37 19 Saddleback Vly 44 42 0.2 12 3 27 39 20 Central Coastal 43 41 0.3 9 4 25 38 21 Capistrano Vly 44 42 0.2 8 3 19 39 Riverside County: South Coast Air Basin 22 Norco/Corona 42 38 0.3 14 5 25 35 23 Metro Riverside Co 43 39 0.6 15 6 24 36 24 Perris Vly 39 38 0.3 11 4 24 35 25 Lake Elsinore 42 39 0.2 8 2 15 36 26 Temecula Vly 41 37 0.2 8 3 15 34 27 Anza Vly 41 39 0.2 7 3 15 36 28 Hemet/San Jacinto 40 38 0.2 8 5 21 35 29 Banning 43 42 0.2 7 6 12 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 44 42 0.2 15 8 15 44 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 39 37 0.2 9 4 14 34 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 47 44 0.3 15 6 16 41 33 SW San Bernardino Vly 41 37 0.3 15 6 27 34 34 C San Bernardino Vly 39 37 0.3 8 4 28 34 35 E San Bernardino Vly 39 36 0.4 11 5 26 33 36 W San Bernardino Mtns 43 41 0.2 13 4 24 38 37 C San Bernardino Mtns 41 39 0.2 10 4 27 36 38 Big Bear Lake 39 38 0.2 8 6 23 35 San Bernardino County: Mojave Desert Air Basin 39 Phelan 45 44 0.2 10 3 26 41 40 Hesperia 39 38 0.2 9 4 28 35 41 Trona 41 38 0.2 5 3 16 35 42 Victorville 40 40 0.2 9 4 27 37 43 Yucca Vly 44 41 0.2 10 5 20 38 44 Barstow 45 42 0.2 6 3 35 39 45 Twentynine Palms 39 38 0.2 10 5 19 35 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., NOV. 21, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 39 PM2.5 Banning Pass Area AQI: 39 Ozone Big Bear Lake AQI: 35 Ozone Central Mojave Desert AQI: 38 Ozone Coachella Valley/Low Desert AQI: 44 PM2.5 Coastal Area AQI: 50 PM2.5 Hemet/Elsinore Area AQI: 36 Ozone Inland Orange County AQI: 39 PM2.5 Metropolitan Area AQI: 50 PM2.5 Northern Mojave Desert AQI: 39 Ozone Riverside Valley AQI: 36 Ozone San Bernardino Mountains AQI: 38 Ozone San Bernardino Valley AQI: 41 Ozone San Fernando/Santa Clarita Valleys AQI: 39 PM2.5 San Gabriel Mountains AQI: 34 Ozone San Gabriel Valley AQI: 39 PM2.5 Temecula/Anza Area AQI: 36 Ozone Victor Valley AQI: 41 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Widespread rainfall is expected Friday. The National Weather Service (NWS) has issued a Winter Storm Warning for the mountains in San Bernardino and Riverside Counties including Big Bear Lake until 4 PM on Friday. NWS has also issued a Winter Weather Advisory for the San Gabriel Mountains in Los Angeles County including Mount Wilson and Mount Baldy until 4 PM on Friday. Inversion Base: 486 FT | Breaking Temperature: 60 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 6171 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 FRIDAY, NOVEMBER 21, 2025 IN THE SOUTH COAST AIR BASIN.