SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SUN., DEC. 28, 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 36 30 0.5 22 12 36 56 2 NW Coastal LA 43 33 0.5 20 8 24 44 3 SW Coastal LA 40 31 0.7 22 14 34 60 4 S Coastal LA 38 31 1.1 28 18 35 68 5 Southeast LA Co 36 30 1.5 29 16 36 64 6 W San Fernando Vly 41 36 0.6 17 3 27 33 7 E San Fernando Vly 38 32 0.6 21 7 32 39 8 W San Gabriel Vly 38 33 0.6 21 7 32 39 9 E San Gabriel Vly 40 36 0.3 12 4 23 33 10 Pomona Walnut Vly 37 31 0.8 26 8 36 44 11 S San Gabriel Vly 34 29 1.0 27 11 35 55 12 S Central LA Co 36 30 1.5 25 20 35 71 13 Santa Clarita Vly 44 41 0.3 17 5 19 38 15 San Gabriel Mts 40 37 0.5 20 5 29 34 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 40 37 0.4 14 7 23 39 Orange County: South Coast Air Basin 16 N Orange Co 40 33 0.8 31 12 32 56 17 Central Orange Co 36 31 1.0 31 11 38 55 18 N Coastal Orange Co 37 31 1.0 27 15 34 62 19 Saddleback Vly 40 36 0.4 27 7 31 39 20 Central Coastal 38 33 0.6 22 11 26 55 21 Capistrano Vly 38 34 0.4 15 8 20 44 Riverside County: South Coast Air Basin 22 Norco/Corona 41 36 0.7 29 9 30 50 23 Metro Riverside Co 42 36 0.6 32 10 29 53 24 Perris Vly 40 35 0.6 17 7 25 39 25 Lake Elsinore 44 38 0.3 11 6 17 35 26 Temecula Vly 43 37 0.3 16 3 16 34 27 Anza Vly 43 40 0.3 18 3 17 37 28 Hemet/San Jacinto 42 38 0.5 14 4 22 35 29 Banning 44 41 0.5 13 5 17 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 47 42 0.2 31 7 19 39 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 36 34 0.2 18 3 15 31 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 43 39 0.5 12 6 30 36 33 SW San Bernardino Vly 39 34 0.8 29 9 34 50 34 C San Bernardino Vly 41 37 0.6 15 6 30 34 35 E San Bernardino Vly 37 33 0.6 17 6 27 33 36 W San Bernardino Mtns 42 39 0.5 15 4 29 36 37 C San Bernardino Mtns 43 39 0.6 16 5 29 36 38 Big Bear Lake 43 41 0.5 15 8 27 44 San Bernardino County: Mojave Desert Air Basin 39 Phelan 45 44 0.5 16 5 30 41 40 Hesperia 38 34 0.5 17 7 31 39 41 Trona 36 32 0.3 10 3 11 30 42 Victorville 41 37 0.5 17 8 31 44 43 Yucca Vly 46 44 0.3 20 4 24 41 44 Barstow 39 35 0.4 12 5 39 37 45 Twentynine Palms 38 35 0.3 20 4 22 32 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SUN., DEC. 28, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 39 PM2.5 Banning Pass Area AQI: 38 Ozone Big Bear Lake AQI: 44 PM2.5 Central Mojave Desert AQI: 41 Ozone Coachella Valley/Low Desert AQI: 39 PM2.5 Hemet/Elsinore Area AQI: 39 PM2.5 Northern Mojave Desert AQI: 37 NO2 San Bernardino Mountains AQI: 36 Ozone San Bernardino Valley AQI: 50 PM2.5 San Fernando/Santa Clarita Valleys AQI: 39 PM2.5 San Gabriel Mountains AQI: 34 Ozone Temecula/Anza Area AQI: 37 Ozone Victor Valley AQI: 44 PM2.5 MODERATE in the following area(s): Coastal Area AQI: 68 PM2.5 Inland Orange County AQI: 55 PM2.5 Metropolitan Area AQI: 71 PM2.5 Riverside Valley AQI: 53 PM2.5 San Gabriel Valley AQI: 55 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ The weather will be slightly warmer on Sunday, with periods of weak to moderate strength gusty Santa Ana winds. Inversion Base: 486 FT | Breaking Temperature: 55 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2682 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 Above 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 SUNDAY, DECEMBER 28, 2025 IN THE SOUTH COAST AIR BASIN.