SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: MON., DEC. 15, 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 40 30 0.7 41 25 42 81 2 NW Coastal LA 46 34 0.9 36 17 38 66 3 SW Coastal LA 45 32 1.3 38 22 39 75 4 S Coastal LA 41 31 1.6 37 25 45 81 5 Southeast LA Co 38 28 2.9 40 27 49 84 6 W San Fernando Vly 47 39 1.8 32 11 44 55 7 E San Fernando Vly 43 33 1.4 40 15 45 62 8 W San Gabriel Vly 47 39 1.1 39 16 47 64 9 E San Gabriel Vly 44 37 0.8 26 10 45 53 10 Pomona Walnut Vly 40 30 1.2 41 16 48 64 11 S San Gabriel Vly 36 26 1.3 40 22 49 75 12 S Central LA Co 42 33 2.9 39 28 43 86 13 Santa Clarita Vly 47 40 0.4 33 8 23 44 15 San Gabriel Mts 46 40 1.0 38 11 44 55 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 39 31 0.7 29 18 34 68 Orange County: South Coast Air Basin 16 N Orange Co 37 27 0.9 49 23 40 77 17 Central Orange Co 40 28 1.2 37 25 44 81 18 N Coastal Orange Co 34 25 1.5 35 26 43 82 19 Saddleback Vly 47 36 0.6 49 16 43 64 20 Central Coastal 41 29 0.8 43 32 35 94 21 Capistrano Vly 46 35 0.6 45 33 30 96 Riverside County: South Coast Air Basin 22 Norco/Corona 47 37 1.4 64 24 47 79 23 Metro Riverside Co 49 38 1.5 72 31 50 92 24 Perris Vly 42 34 1.0 49 14 45 60 25 Lake Elsinore 47 40 0.6 35 9 28 50 26 Temecula Vly 45 41 0.5 33 8 26 44 27 Anza Vly 48 44 0.4 29 7 25 41 28 Hemet/San Jacinto 46 41 0.9 34 7 41 39 29 Banning 47 42 0.9 29 6 36 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 49 45 0.3 37 14 24 60 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 37 32 0.3 25 6 20 33 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 49 40 0.9 21 12 46 56 33 SW San Bernardino Vly 43 32 1.4 62 21 51 73 34 C San Bernardino Vly 40 34 1.2 39 15 55 62 35 E San Bernardino Vly 43 37 1.1 50 12 47 56 36 W San Bernardino Mtns 48 41 1.0 29 7 47 44 37 C San Bernardino Mtns 45 39 1.1 38 6 44 42 38 Big Bear Lake 53 48 1.1 34 13 41 58 San Bernardino County: Mojave Desert Air Basin 39 Phelan 44 43 0.9 30 7 37 40 40 Hesperia 36 32 1.0 31 7 42 40 41 Trona 35 25 0.5 22 6 14 33 42 Victorville 37 33 0.9 31 8 35 44 43 Yucca Vly 48 45 0.6 28 8 28 44 44 Barstow 34 23 0.7 27 6 39 37 45 Twentynine Palms 41 36 0.5 27 7 26 39 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON MON., DEC. 15, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 39 Ozone Central Mojave Desert AQI: 44 PM2.5 Northern Mojave Desert AQI: 37 NO2 San Bernardino Mountains AQI: 44 NO2 Temecula/Anza Area AQI: 44 PM2.5 Victor Valley AQI: 44 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 68 PM2.5 Big Bear Lake AQI: 58 PM2.5 Coachella Valley/Low Desert AQI: 60 PM2.5 Coastal Area AQI: 94 PM2.5 Hemet/Elsinore Area AQI: 60 PM2.5 Inland Orange County AQI: 96 PM2.5 Metropolitan Area AQI: 86 PM2.5 Riverside Valley AQI: 92 PM2.5 San Bernardino Valley AQI: 73 PM2.5 San Fernando/Santa Clarita Valleys AQI: 62 PM2.5 San Gabriel Mountains AQI: 55 PM2.5 San Gabriel Valley AQI: 75 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Morning dense fog and low clouds are expected, followed by clearing late in the morning, with weak offshore winds developing and warm, dry conditions through the afternoon. Inversion Base: 486 FT | Breaking Temperature: 69 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1845 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 MONDAY, DECEMBER 15, 2025 IN THE SOUTH COAST AIR BASIN.