SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., SEP. 25, 2026 -------------------------------------------------------------------------------- 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 69 56 0.8 31 12 29 56 2 NW Coastal LA 52 46 0.4 30 10 18 53 3 SW Coastal LA 36 32 0.1 31 7 11 39 4 S Coastal LA 54 45 0.3 30 9 23 50 5 Southeast LA Co 65 53 0.6 32 12 24 56 6 W San Fernando Vly 71 60 0.3 30 10 22 67 7 E San Fernando Vly 70 59 0.6 32 12 23 64 8 W San Gabriel Vly 78 64 0.4 35 11 15 80 9 E San Gabriel Vly 86 72 0.5 41 12 24 105 10 Pomona Walnut Vly 84 72 0.4 41 14 26 105 11 S San Gabriel Vly 75 61 0.4 37 13 23 71 12 S Central LA Co 61 46 0.2 31 11 15 55 13 Santa Clarita Vly 74 64 0.4 30 10 22 80 15 San Gabriel Mts 71 62 0.4 41 9 24 74 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 59 55 0.3 29 11 26 55 Orange County: South Coast Air Basin 16 N Orange Co 67 57 0.2 39 12 16 58 17 Central Orange Co 62 56 0.3 30 11 18 55 18 N Coastal Orange Co 57 49 0.3 30 6 22 45 19 Saddleback Vly 66 59 0.2 39 10 19 64 20 Central Coastal 60 54 0.2 30 8 19 50 21 Capistrano Vly 59 54 0.3 29 8 19 50 Riverside County: South Coast Air Basin 22 Norco/Corona 87 76 0.4 49 13 19 118 23 Metro Riverside Co 98 86 0.4 54 16 18 151 24 Perris Vly 81 72 0.4 42 13 29 105 25 Lake Elsinore 62 56 0.3 29 12 19 56 26 Temecula Vly 61 56 0.3 29 9 17 54 27 Anza Vly 64 60 0.2 29 6 14 67 28 Hemet/San Jacinto 72 65 0.4 38 11 31 84 29 Banning 75 65 0.3 36 8 30 84 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 64 56 0.2 30 7 10 54 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 43 42 0.2 29 6 11 39 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 83 72 0.7 38 14 25 105 33 SW San Bernardino Vly 85 75 0.5 49 15 29 115 34 C San Bernardino Vly 83 74 0.4 43 13 35 112 35 E San Bernardino Vly 87 76 0.4 43 11 32 118 36 W San Bernardino Mtns 80 70 0.4 39 10 31 100 37 C San Bernardino Mtns 86 75 0.4 42 6 33 115 38 Big Bear Lake 70 65 0.4 39 6 32 84 San Bernardino County: Mojave Desert Air Basin 39 Phelan 62 58 0.4 34 6 31 61 40 Hesperia 63 60 0.4 33 8 34 67 41 Trona 54 49 0.2 31 6 11 45 42 Victorville 68 65 0.4 34 9 32 84 43 Yucca Vly 61 57 0.3 30 6 21 58 44 Barstow 65 59 0.3 33 8 44 64 45 Twentynine Palms 49 48 0.2 30 6 19 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., SEP. 25, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... MODERATE in the following area(s): Antelope Valley AQI: 55 PM2.5 Banning Pass Area AQI: 84 Ozone Big Bear Lake AQI: 84 Ozone Central Mojave Desert AQI: 58 Ozone Coachella Valley/Low Desert AQI: 54 Ozone Coastal Area AQI: 53 PM2.5 Inland Orange County AQI: 64 Ozone Metropolitan Area AQI: 58 Ozone Northern Mojave Desert AQI: 64 Ozone San Fernando/Santa Clarita Valleys AQI: 80 Ozone San Gabriel Mountains AQI: 74 Ozone Temecula/Anza Area AQI: 67 Ozone Victor Valley AQI: 84 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Hemet/Elsinore Area AQI: 105 Ozone San Bernardino Mountains AQI: 115 Ozone San Bernardino Valley AQI: 118 Ozone San Gabriel Valley AQI: 105 Ozone UNHEALTHY in the following area(s): Riverside Valley AQI: 151 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures will remain high throughout this week. Winds are predicted to be stagnant or slightly onshore. Inversion Base: 1550 FT | Breaking Temperature: 86 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2012 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: 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 FRIDAY, SEPTEMBER 25, 2026 IN THE SOUTH COAST AIR BASIN.