SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., DEC. 19, 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 30 19 0.6 39 36 47 102 2 NW Coastal LA 40 30 0.8 35 30 34 90 3 SW Coastal LA 32 25 0.8 37 30 40 90 4 S Coastal LA 41 29 1.3 41 28 39 86 5 Southeast LA Co 42 27 1.5 42 37 43 105 6 W San Fernando Vly 49 35 1.3 31 15 35 62 7 E San Fernando Vly 34 23 1.1 38 27 42 84 8 W San Gabriel Vly 43 29 0.8 37 28 41 86 9 E San Gabriel Vly 42 32 0.8 25 23 48 77 10 Pomona Walnut Vly 47 35 0.9 42 31 52 92 11 S San Gabriel Vly 38 23 0.7 40 38 41 107 12 S Central LA Co 41 28 1.5 39 36 35 102 13 Santa Clarita Vly 47 37 0.6 33 10 28 53 15 San Gabriel Mts 44 35 0.9 37 16 43 64 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 44 38 0.7 32 21 27 73 Orange County: South Coast Air Basin 16 N Orange Co 48 31 0.5 48 32 31 94 17 Central Orange Co 51 37 1.2 43 30 35 90 18 N Coastal Orange Co 55 44 1.2 39 25 37 81 19 Saddleback Vly 54 47 0.5 48 15 37 62 20 Central Coastal 58 50 0.7 35 31 32 92 21 Capistrano Vly 60 53 0.6 46 32 30 94 Riverside County: South Coast Air Basin 22 Norco/Corona 54 43 1.0 60 32 41 94 23 Metro Riverside Co 55 41 1.1 67 36 46 102 24 Perris Vly 55 46 0.9 49 16 43 64 25 Lake Elsinore 54 48 0.6 30 17 30 66 26 Temecula Vly 48 44 0.5 28 4 28 41 27 Anza Vly 50 46 0.4 27 4 28 43 28 Hemet/San Jacinto 51 46 0.8 39 5 40 43 29 Banning 49 45 0.8 33 6 36 42 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 49 44 0.2 38 7 29 41 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 40 36 0.3 24 4 21 33 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 58 45 0.8 33 25 43 81 33 SW San Bernardino Vly 49 37 1.0 58 34 48 97 34 C San Bernardino Vly 49 41 1.1 50 20 51 71 35 E San Bernardino Vly 49 43 1.0 53 10 44 53 36 W San Bernardino Mtns 52 42 1.0 30 16 45 64 37 C San Bernardino Mtns 52 47 1.1 46 7 43 44 38 Big Bear Lake 48 45 1.0 40 4 40 42 San Bernardino County: Mojave Desert Air Basin 39 Phelan 49 44 0.9 28 5 40 41 40 Hesperia 45 40 0.9 27 7 42 40 41 Trona 37 28 0.4 18 4 14 26 42 Victorville 48 43 0.8 28 10 39 53 43 Yucca Vly 51 48 0.5 28 4 30 44 44 Barstow 35 23 0.6 27 9 38 50 45 Twentynine Palms 42 39 0.4 27 4 28 36 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., DEC. 19, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 42 Ozone Big Bear Lake AQI: 42 Ozone Central Mojave Desert AQI: 44 Ozone Coachella Valley/Low Desert AQI: 41 Ozone Northern Mojave Desert AQI: 50 PM2.5 Temecula/Anza Area AQI: 43 Ozone MODERATE in the following area(s): Antelope Valley AQI: 73 PM2.5 Coastal Area AQI: 92 PM2.5 Hemet/Elsinore Area AQI: 66 PM2.5 Inland Orange County AQI: 94 PM2.5 San Bernardino Mountains AQI: 64 PM2.5 San Bernardino Valley AQI: 97 PM2.5 San Fernando/Santa Clarita Valleys AQI: 84 PM2.5 San Gabriel Mountains AQI: 64 PM2.5 Victor Valley AQI: 53 PM2.5 UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Metropolitan Area AQI: 105 PM2.5 Riverside Valley AQI: 102 PM2.5 San Gabriel Valley AQI: 107 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Onshore flow will start on Friday, bringing low clouds/ fog to the coast and about 2-6 degrees of cooling compared to Thursday. This is still around 15 degrees warmer than normal. Inland areas will start off cloudy before becoming mostly sunny. Inversion Base: 486 FT | Breaking Temperature: 73 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1408 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: NO-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: Prohibited in South Coast Air Basin Below 3000 ft 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, DECEMBER 19, 2025 IN THE SOUTH COAST AIR BASIN.