SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., DEC. 16, 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 23 0.7 44 26 45 82 2 NW Coastal LA 38 31 0.8 41 22 36 75 3 SW Coastal LA 39 30 1.3 43 29 35 88 4 S Coastal LA 29 23 1.6 50 29 50 88 5 Southeast LA Co 30 22 2.4 51 28 52 86 6 W San Fernando Vly 45 36 1.5 39 14 44 60 7 E San Fernando Vly 38 30 1.2 44 18 52 68 8 W San Gabriel Vly 42 32 1.1 43 19 56 69 9 E San Gabriel Vly 37 30 0.7 26 16 43 64 10 Pomona Walnut Vly 35 24 1.2 55 23 53 77 11 S San Gabriel Vly 28 20 1.3 49 24 52 79 12 S Central LA Co 33 25 2.4 46 35 43 99 13 Santa Clarita Vly 43 37 0.4 41 7 26 39 15 San Gabriel Mts 42 36 0.9 43 13 50 58 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 39 35 0.6 43 25 33 81 Orange County: South Coast Air Basin 16 N Orange Co 29 21 0.8 65 25 45 81 17 Central Orange Co 34 24 1.3 53 25 45 81 18 N Coastal Orange Co 30 23 1.5 49 30 47 90 19 Saddleback Vly 42 36 0.5 65 13 45 58 20 Central Coastal 38 31 0.8 47 29 39 88 21 Capistrano Vly 43 36 0.6 43 23 35 77 Riverside County: South Coast Air Basin 22 Norco/Corona 40 32 1.2 82 29 49 88 23 Metro Riverside Co 41 31 1.3 94 36 49 102 24 Perris Vly 42 35 0.9 58 13 44 58 25 Lake Elsinore 48 41 0.6 43 8 34 44 26 Temecula Vly 43 39 0.5 40 2 30 37 27 Anza Vly 47 44 0.4 37 3 25 41 28 Hemet/San Jacinto 44 40 0.8 46 4 40 43 29 Banning 45 40 0.8 41 4 35 38 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 43 0.2 45 13 20 58 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 36 32 0.2 33 5 17 31 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 48 38 0.9 31 22 46 75 33 SW San Bernardino Vly 37 27 1.2 82 30 51 90 34 C San Bernardino Vly 36 30 1.1 53 19 54 69 35 E San Bernardino Vly 40 34 1.0 57 11 46 55 36 W San Bernardino Mtns 44 38 0.9 38 14 47 60 37 C San Bernardino Mtns 42 35 1.1 50 7 44 46 38 Big Bear Lake 46 43 1.0 46 11 40 55 San Bernardino County: Mojave Desert Air Basin 39 Phelan 43 42 0.8 37 9 40 50 40 Hesperia 34 31 0.9 38 7 43 41 41 Trona 23 21 0.4 30 3 13 28 42 Victorville 36 31 0.8 38 8 40 44 43 Yucca Vly 43 42 0.5 36 6 26 39 44 Barstow 31 21 0.6 33 8 41 44 45 Twentynine Palms 38 35 0.4 36 6 23 33 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., DEC. 16, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 38 PM10 Central Mojave Desert AQI: 39 Ozone Northern Mojave Desert AQI: 44 PM2.5 Temecula/Anza Area AQI: 41 Ozone Victor Valley AQI: 50 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 81 PM2.5 Big Bear Lake AQI: 55 PM2.5 Coachella Valley/Low Desert AQI: 58 PM2.5 Coastal Area AQI: 90 PM2.5 Hemet/Elsinore Area AQI: 58 PM2.5 Inland Orange County AQI: 81 PM2.5 Metropolitan Area AQI: 99 PM2.5 San Bernardino Mountains AQI: 60 PM2.5 San Bernardino Valley AQI: 90 PM2.5 San Fernando/Santa Clarita Valleys AQI: 68 PM2.5 San Gabriel Mountains AQI: 58 PM2.5 San Gabriel Valley AQI: 79 PM2.5 UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 102 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Patchy dense fog and low clouds are expected in the morning, mainly on coastal mesas and western valleys, followed by mostly sunny skies. Weak offshore winds may produce localized northeast gusts up to 30–40 mph near foothills and passes. Warm and dry, with temperatures well above normal. Inversion Base: 486 FT | Breaking Temperature: 72 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2089 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 TUESDAY, DECEMBER 16, 2025 IN THE SOUTH COAST AIR BASIN.