SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SAT., DEC. 13, 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 46 31 0.6 39 18 37 68 2 NW Coastal LA 52 36 0.7 35 29 29 88 3 SW Coastal LA 50 36 0.8 37 20 26 71 4 S Coastal LA 42 33 0.9 35 12 40 56 5 Southeast LA Co 39 31 1.7 38 27 38 84 6 W San Fernando Vly 50 39 1.3 31 16 32 64 7 E San Fernando Vly 46 34 1.1 38 8 36 44 8 W San Gabriel Vly 44 37 0.9 37 6 37 35 9 E San Gabriel Vly 44 37 0.7 22 9 39 50 10 Pomona Walnut Vly 40 29 1.0 37 26 41 82 11 S San Gabriel Vly 38 29 0.9 38 27 37 84 12 S Central LA Co 45 33 1.7 37 22 28 75 13 Santa Clarita Vly 51 39 0.4 32 5 21 36 15 San Gabriel Mts 46 39 0.8 36 5 36 36 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 38 32 0.6 28 6 38 36 Orange County: South Coast Air Basin 16 N Orange Co 43 30 0.6 42 32 31 94 17 Central Orange Co 44 31 1.3 35 22 43 75 18 N Coastal Orange Co 34 27 1.0 33 5 40 38 19 Saddleback Vly 56 41 0.5 42 18 40 68 20 Central Coastal 44 32 0.7 29 15 33 62 21 Capistrano Vly 50 38 0.6 26 15 29 62 Riverside County: South Coast Air Basin 22 Norco/Corona 52 37 1.0 54 28 42 86 23 Metro Riverside Co 50 36 1.1 61 30 43 90 24 Perris Vly 54 42 0.8 42 24 38 79 25 Lake Elsinore 60 49 0.6 25 10 26 53 26 Temecula Vly 54 46 0.5 24 7 26 43 27 Anza Vly 48 43 0.4 22 5 27 40 28 Hemet/San Jacinto 51 45 0.7 32 6 36 42 29 Banning 48 43 0.7 27 8 34 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 48 39 0.2 37 6 30 36 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 31 27 0.2 22 5 23 28 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 55 43 0.9 25 20 36 71 33 SW San Bernardino Vly 45 31 1.1 53 33 42 96 34 C San Bernardino Vly 43 35 1.1 39 12 45 56 35 E San Bernardino Vly 46 39 0.9 47 12 39 56 36 W San Bernardino Mtns 50 42 0.8 30 5 39 39 37 C San Bernardino Mtns 48 39 0.9 38 9 40 50 38 Big Bear Lake 51 46 0.8 33 7 37 43 San Bernardino County: Mojave Desert Air Basin 39 Phelan 44 41 0.7 30 5 36 38 40 Hesperia 36 30 0.8 32 8 38 44 41 Trona 31 19 0.3 24 5 16 28 42 Victorville 39 32 0.7 31 11 36 55 43 Yucca Vly 44 41 0.4 26 5 32 38 44 Barstow 35 22 0.5 21 5 44 42 45 Twentynine Palms 34 32 0.3 25 5 30 30 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SAT., DEC. 13, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 36 NO2 Banning Pass Area AQI: 44 PM2.5 Big Bear Lake AQI: 43 Ozone Central Mojave Desert AQI: 38 Ozone Coachella Valley/Low Desert AQI: 36 Ozone Northern Mojave Desert AQI: 42 NO2 San Bernardino Mountains AQI: 50 PM2.5 San Gabriel Mountains AQI: 36 Ozone Temecula/Anza Area AQI: 43 Ozone MODERATE in the following area(s): Coastal Area AQI: 88 PM2.5 Hemet/Elsinore Area AQI: 79 PM2.5 Inland Orange County AQI: 75 PM2.5 Metropolitan Area AQI: 94 PM2.5 Riverside Valley AQI: 90 PM2.5 San Bernardino Valley AQI: 96 PM2.5 San Fernando/Santa Clarita Valleys AQI: 64 PM2.5 San Gabriel Valley AQI: 84 PM2.5 Victor Valley AQI: 55 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Mostly sunny, except for patchy morning low clouds and fog along the coast. Inversion Base: 486 FT | Breaking Temperature: 70 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1555 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 SATURDAY, DECEMBER 13, 2025 IN THE SOUTH COAST AIR BASIN.