SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., DEC. 31, 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 21 23 0.6 19 12 36 56 2 NW Coastal LA 34 26 0.6 16 13 19 58 3 SW Coastal LA 33 22 0.6 17 17 29 66 4 S Coastal LA 27 23 0.6 19 17 35 66 5 Southeast LA Co 17 23 0.7 19 17 35 66 6 W San Fernando Vly 33 31 0.9 13 11 25 55 7 E San Fernando Vly 29 25 0.8 18 11 29 55 8 W San Gabriel Vly 16 24 0.3 18 9 21 50 9 E San Gabriel Vly 22 24 0.4 16 5 27 28 10 Pomona Walnut Vly 22 19 0.5 22 10 34 53 11 S San Gabriel Vly 14 21 0.7 19 12 35 56 12 S Central LA Co 14 24 0.3 25 20 33 71 13 Santa Clarita Vly 35 33 0.3 12 10 21 53 15 San Gabriel Mts 29 28 0.5 17 8 30 44 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 36 31 0.4 13 7 30 39 Orange County: South Coast Air Basin 16 N Orange Co 19 24 0.6 24 14 30 60 17 Central Orange Co 22 23 0.7 19 15 27 62 18 N Coastal Orange Co 30 25 0.6 17 13 32 58 19 Saddleback Vly 31 28 0.3 23 7 27 39 20 Central Coastal 30 27 0.4 14 9 25 50 21 Capistrano Vly 32 29 0.3 10 6 22 33 Riverside County: South Coast Air Basin 22 Norco/Corona 26 24 0.5 32 13 29 58 23 Metro Riverside Co 29 26 0.7 36 15 34 62 24 Perris Vly 26 25 0.6 18 9 30 50 25 Lake Elsinore 35 27 0.4 7 6 21 33 26 Temecula Vly 32 30 0.3 12 4 22 28 27 Anza Vly 40 37 0.3 14 4 23 34 28 Hemet/San Jacinto 34 32 0.5 15 6 28 33 29 Banning 38 36 0.4 15 8 25 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 41 37 0.3 17 11 26 55 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 26 24 0.3 12 6 21 33 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 17 15 0.6 19 9 35 50 33 SW San Bernardino Vly 22 19 0.6 32 12 34 56 34 C San Bernardino Vly 27 24 0.5 16 11 33 55 35 E San Bernardino Vly 26 23 0.6 20 10 32 53 36 W San Bernardino Mtns 29 26 0.5 18 7 31 39 37 C San Bernardino Mtns 38 32 0.5 16 9 29 50 38 Big Bear Lake 38 35 0.5 16 11 31 55 San Bernardino County: Mojave Desert Air Basin 39 Phelan 39 37 0.5 13 5 26 34 40 Hesperia 33 26 0.5 14 7 28 39 41 Trona 33 29 0.3 9 4 16 27 42 Victorville 36 28 0.4 13 7 23 39 43 Yucca Vly 41 39 0.3 15 6 29 36 44 Barstow 27 29 0.4 12 4 39 37 45 Twentynine Palms 31 29 0.3 14 6 27 33 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., DEC. 31, 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: 44 PM2.5 Central Mojave Desert AQI: 36 Ozone Hemet/Elsinore Area AQI: 50 PM2.5 Northern Mojave Desert AQI: 37 NO2 San Bernardino Mountains AQI: 50 PM2.5 San Gabriel Mountains AQI: 44 PM2.5 Temecula/Anza Area AQI: 34 Ozone Victor Valley AQI: 39 PM2.5 MODERATE in the following area(s): Big Bear Lake AQI: 55 PM2.5 Coachella Valley/Low Desert AQI: 55 PM2.5 Coastal Area AQI: 66 PM2.5 Inland Orange County AQI: 62 PM2.5 Metropolitan Area AQI: 71 PM2.5 Riverside Valley AQI: 62 PM2.5 San Bernardino Valley AQI: 56 PM2.5 San Fernando/Santa Clarita Valleys AQI: 55 PM2.5 San Gabriel Valley AQI: 56 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Another wet storm system will move over SoCal on New Year's Eve. While not as strong as last week's rain, it will still dampen outdoor NYE festivities. Temperatures will be 4-7 degrees cooler than Tuesday, and light to moderate offshore (east to northeast) winds will replace the Santa Ana winds of Monday- Tuesday. Inversion Base: 486 FT | Breaking Temperature: 69 DEG F Inversion Breaking: NO | Maximum Mixing HEIGHT: 866 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 31, 2025 IN THE SOUTH COAST AIR BASIN.