SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: THU., SEP. 24, 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 73 58 0.7 32 13 21 61 2 NW Coastal LA 54 47 0.4 30 10 15 53 3 SW Coastal LA 46 39 0.4 31 10 12 52 4 S Coastal LA 62 49 0.3 30 10 24 53 5 Southeast LA Co 68 53 0.5 33 13 27 58 6 W San Fernando Vly 71 61 0.5 29 10 19 71 7 E San Fernando Vly 71 61 0.6 32 12 24 71 8 W San Gabriel Vly 80 64 0.4 36 12 20 80 9 E San Gabriel Vly 92 77 0.5 42 13 27 122 10 Pomona Walnut Vly 81 71 0.5 42 15 23 101 11 S San Gabriel Vly 75 60 0.4 38 14 27 67 12 S Central LA Co 65 49 0.2 31 12 15 56 13 Santa Clarita Vly 84 71 0.4 30 10 26 101 15 San Gabriel Mts 76 66 0.5 42 10 31 87 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 65 59 0.4 30 11 34 64 Orange County: South Coast Air Basin 16 N Orange Co 70 58 0.2 39 13 19 61 17 Central Orange Co 60 50 0.4 28 12 12 56 18 N Coastal Orange Co 54 48 0.3 28 5 21 44 19 Saddleback Vly 61 55 0.2 39 8 20 51 20 Central Coastal 55 50 0.3 29 6 20 46 21 Capistrano Vly 55 51 0.4 31 8 21 47 Riverside County: South Coast Air Basin 22 Norco/Corona 81 71 0.4 50 14 21 101 23 Metro Riverside Co 89 77 0.4 54 16 20 122 24 Perris Vly 80 70 0.5 44 13 34 100 25 Lake Elsinore 58 55 0.4 31 11 22 55 26 Temecula Vly 50 48 0.3 36 8 20 44 27 Anza Vly 48 50 0.3 39 5 19 46 28 Hemet/San Jacinto 67 60 0.5 37 8 36 67 29 Banning 66 62 0.5 34 8 35 74 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 57 53 0.2 45 5 19 49 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 42 40 0.2 31 5 16 37 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 81 72 0.7 36 14 31 105 33 SW San Bernardino Vly 80 71 0.6 49 15 37 101 34 C San Bernardino Vly 84 73 0.6 42 12 46 108 35 E San Bernardino Vly 87 75 0.6 47 10 37 115 36 W San Bernardino Mtns 77 68 0.6 38 10 37 93 37 C San Bernardino Mtns 84 73 0.6 40 7 38 108 38 Big Bear Lake 63 60 0.5 38 5 37 67 San Bernardino County: Mojave Desert Air Basin 39 Phelan 56 55 0.5 34 6 34 51 40 Hesperia 60 57 0.5 32 8 38 58 41 Trona 52 48 0.3 23 5 12 44 42 Victorville 63 60 0.5 34 9 34 67 43 Yucca Vly 47 48 0.3 31 5 27 44 44 Barstow 57 51 0.4 39 6 50 47 45 Twentynine Palms 42 40 0.3 30 5 25 37 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON THU., SEP. 24, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Central Mojave Desert AQI: 44 Ozone Coachella Valley/Low Desert AQI: 49 Ozone Northern Mojave Desert AQI: 47 Ozone Temecula/Anza Area AQI: 46 Ozone MODERATE in the following area(s): Antelope Valley AQI: 64 Ozone Banning Pass Area AQI: 74 Ozone Big Bear Lake AQI: 67 Ozone Coastal Area AQI: 53 PM2.5 Hemet/Elsinore Area AQI: 100 Ozone Inland Orange County AQI: 56 PM2.5 Metropolitan Area AQI: 61 Ozone San Gabriel Mountains AQI: 87 Ozone Victor Valley AQI: 67 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 122 Ozone San Bernardino Mountains AQI: 108 Ozone San Bernardino Valley AQI: 115 Ozone San Fernando/Santa Clarita Valleys AQI: 101 Ozone San Gabriel Valley AQI: 122 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures on Thursday are forecast to be similar to Wednesday. Light offshore flow in the mornings will lead to light onshore flow in the afternoons. There may be monsoonal moisture in mountain areas. Inversion Base: 1526 FT | Breaking Temperature: 83 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2194 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 9, 10, 13, 22, 23, 32, 33, 34, 35, 37 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 THURSDAY, SEPTEMBER 24, 2026 IN THE SOUTH COAST AIR BASIN.