SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: MON., DEC. 22, 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 37 30 1.0 40 25 37 81 2 NW Coastal LA 40 32 0.7 36 15 25 62 3 SW Coastal LA 34 28 0.9 38 15 29 62 4 S Coastal LA 38 30 0.9 44 15 34 62 5 Southeast LA Co 37 31 1.0 45 24 34 79 6 W San Fernando Vly 42 34 1.1 32 13 37 58 7 E San Fernando Vly 36 29 1.0 39 16 34 64 8 W San Gabriel Vly 46 37 0.8 41 17 31 66 9 E San Gabriel Vly 41 33 0.7 38 18 38 68 10 Pomona Walnut Vly 40 31 1.0 48 25 41 81 11 S San Gabriel Vly 39 31 0.6 45 26 33 82 12 S Central LA Co 40 32 1.0 41 19 26 69 13 Santa Clarita Vly 56 42 0.5 34 14 28 60 15 San Gabriel Mts 44 35 0.9 38 12 39 56 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 38 32 0.7 32 15 35 62 Orange County: South Coast Air Basin 16 N Orange Co 35 30 0.5 52 28 28 86 17 Central Orange Co 31 28 0.9 47 25 30 81 18 N Coastal Orange Co 31 28 0.9 42 19 32 69 19 Saddleback Vly 46 39 0.5 52 22 30 75 20 Central Coastal 39 33 0.6 38 28 27 86 21 Capistrano Vly 44 37 0.6 34 28 25 86 Riverside County: South Coast Air Basin 22 Norco/Corona 51 40 1.0 63 39 33 110 23 Metro Riverside Co 49 36 1.0 70 37 39 105 24 Perris Vly 48 40 1.0 51 23 41 77 25 Lake Elsinore 49 44 0.6 33 17 25 66 26 Temecula Vly 44 41 0.5 30 5 23 38 27 Anza Vly 40 37 0.4 26 5 22 34 28 Hemet/San Jacinto 47 42 0.9 41 7 39 39 29 Banning 50 45 0.8 34 6 32 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 47 43 0.3 38 9 22 50 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 34 30 0.3 23 5 18 28 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 46 35 1.0 21 16 44 64 33 SW San Bernardino Vly 43 32 1.0 61 31 44 92 34 C San Bernardino Vly 44 34 1.2 52 16 48 64 35 E San Bernardino Vly 44 36 1.1 54 11 43 55 36 W San Bernardino Mtns 40 33 1.0 31 9 44 50 37 C San Bernardino Mtns 48 47 1.1 48 5 44 44 38 Big Bear Lake 44 40 1.0 42 11 41 55 San Bernardino County: Mojave Desert Air Basin 39 Phelan 39 37 0.9 30 7 38 39 40 Hesperia 36 32 1.0 28 7 42 40 41 Trona 31 26 0.5 18 6 13 33 42 Victorville 41 35 0.9 29 10 37 53 43 Yucca Vly 44 42 0.5 27 5 26 39 44 Barstow 32 24 0.7 24 10 38 53 45 Twentynine Palms 38 35 0.5 26 5 24 32 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON MON., DEC. 22, 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 Central Mojave Desert AQI: 39 Ozone Coachella Valley/Low Desert AQI: 50 PM2.5 San Bernardino Mountains AQI: 50 PM2.5 Temecula/Anza Area AQI: 38 Ozone MODERATE in the following area(s): Antelope Valley AQI: 62 PM2.5 Big Bear Lake AQI: 55 PM2.5 Coastal Area AQI: 86 PM2.5 Hemet/Elsinore Area AQI: 77 PM2.5 Inland Orange County AQI: 86 PM2.5 Metropolitan Area AQI: 86 PM2.5 Northern Mojave Desert AQI: 53 PM2.5 San Bernardino Valley AQI: 92 PM2.5 San Fernando/Santa Clarita Valleys AQI: 64 PM2.5 San Gabriel Mountains AQI: 56 PM2.5 San Gabriel Valley AQI: 82 PM2.5 Victor Valley AQI: 53 PM2.5 UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 110 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Partly cloudy skies with cooler temperatures and patchy morning fog along the coast. Inversion Base: 486 FT | Breaking Temperature: 68 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1762 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 22, 2025 IN THE SOUTH COAST AIR BASIN.