SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., DEC. 10, 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 42 31 0.8 32 14 44 60 2 NW Coastal LA 40 30 0.9 28 12 36 56 3 SW Coastal LA 42 30 1.1 30 13 51 58 4 S Coastal LA 33 25 1.6 30 12 65 63 5 Southeast LA Co 36 25 2.0 31 15 59 62 6 W San Fernando Vly 41 34 1.4 26 11 39 55 7 E San Fernando Vly 42 32 1.2 31 11 42 55 8 W San Gabriel Vly 46 37 0.8 31 11 43 55 9 E San Gabriel Vly 41 36 0.6 15 10 44 53 10 Pomona Walnut Vly 42 32 0.9 30 14 40 60 11 S San Gabriel Vly 35 24 1.1 31 15 44 62 12 S Central LA Co 36 27 2.0 31 12 53 56 13 Santa Clarita Vly 44 37 0.3 28 7 24 39 15 San Gabriel Mts 44 37 0.7 31 9 41 50 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 42 32 0.6 29 9 30 50 Orange County: South Coast Air Basin 16 N Orange Co 39 26 0.9 35 19 41 69 17 Central Orange Co 35 25 1.3 30 22 43 75 18 N Coastal Orange Co 36 27 1.4 28 21 57 73 19 Saddleback Vly 45 38 0.5 35 11 41 55 20 Central Coastal 41 33 0.8 26 21 39 73 21 Capistrano Vly 42 36 0.5 23 18 31 68 Riverside County: South Coast Air Basin 22 Norco/Corona 45 35 1.0 42 16 38 64 23 Metro Riverside Co 45 35 1.1 48 18 38 68 24 Perris Vly 43 35 0.8 33 7 37 39 25 Lake Elsinore 46 40 0.5 23 3 27 37 26 Temecula Vly 43 37 0.4 22 3 26 34 27 Anza Vly 44 40 0.4 21 2 27 37 28 Hemet/San Jacinto 44 39 0.8 29 3 37 36 29 Banning 45 42 0.7 26 1 38 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 0.3 36 5 30 39 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 34 31 0.3 21 1 22 29 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 41 34 0.7 21 7 50 47 33 SW San Bernardino Vly 40 31 1.0 42 16 48 64 34 C San Bernardino Vly 42 34 1.0 37 10 49 53 35 E San Bernardino Vly 43 36 0.9 35 6 37 35 36 W San Bernardino Mtns 43 37 0.8 28 6 45 42 37 C San Bernardino Mtns 41 36 1.0 36 8 40 44 38 Big Bear Lake 47 44 0.9 31 10 37 53 San Bernardino County: Mojave Desert Air Basin 39 Phelan 42 41 0.7 30 7 37 39 40 Hesperia 33 28 0.8 32 9 39 50 41 Trona 30 21 0.4 24 2 15 22 42 Victorville 37 30 0.7 32 11 36 55 43 Yucca Vly 46 43 0.5 26 3 31 40 44 Barstow 36 22 0.6 26 5 40 38 45 Twentynine Palms 39 35 0.4 26 2 29 32 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., DEC. 10, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 50 PM2.5 Banning Pass Area AQI: 39 Ozone Central Mojave Desert AQI: 40 Ozone Coachella Valley/Low Desert AQI: 39 Ozone Hemet/Elsinore Area AQI: 39 PM2.5 Northern Mojave Desert AQI: 38 NO2 San Bernardino Mountains AQI: 44 PM2.5 San Gabriel Mountains AQI: 50 PM2.5 Temecula/Anza Area AQI: 37 Ozone MODERATE in the following area(s): Big Bear Lake AQI: 53 PM2.5 Coastal Area AQI: 73 PM2.5 Inland Orange County AQI: 75 PM2.5 Metropolitan Area AQI: 69 PM2.5 Riverside Valley AQI: 68 PM2.5 San Bernardino Valley AQI: 64 PM2.5 San Fernando/Santa Clarita Valleys AQI: 55 PM2.5 San Gabriel Valley AQI: 62 PM2.5 Victor Valley AQI: 55 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Mostly sunny, with warm temperatures expected. Inversion Base: 486 FT | Breaking Temperature: 74 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1937 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 10, 2025 IN THE SOUTH COAST AIR BASIN.