SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SAT., SEP. 26, 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 62 54 0.8 41 11 28 55 2 NW Coastal LA 51 45 0.4 39 12 18 56 3 SW Coastal LA 48 40 0.2 40 9 18 50 4 S Coastal LA 47 41 0.4 39 8 22 44 5 Southeast LA Co 63 52 0.6 40 10 24 53 6 W San Fernando Vly 64 56 0.5 36 8 17 54 7 E San Fernando Vly 64 56 0.6 40 8 22 54 8 W San Gabriel Vly 70 58 0.4 40 8 17 61 9 E San Gabriel Vly 78 64 0.5 35 9 27 80 10 Pomona Walnut Vly 74 64 0.6 42 12 28 80 11 S San Gabriel Vly 74 58 0.4 40 11 24 61 12 S Central LA Co 60 46 0.6 40 10 16 53 13 Santa Clarita Vly 70 56 0.3 36 7 19 54 15 San Gabriel Mts 65 54 0.5 39 6 23 50 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 57 48 0.3 32 7 22 44 Orange County: South Coast Air Basin 16 N Orange Co 71 56 0.2 43 10 16 54 17 Central Orange Co 59 48 0.4 39 10 11 53 18 N Coastal Orange Co 52 47 0.4 38 5 19 44 19 Saddleback Vly 68 58 0.3 43 6 17 61 20 Central Coastal 63 54 0.3 35 6 16 50 21 Capistrano Vly 60 53 0.4 32 7 15 49 Riverside County: South Coast Air Basin 22 Norco/Corona 70 61 0.5 50 11 21 71 23 Metro Riverside Co 77 66 0.6 54 12 22 87 24 Perris Vly 60 57 0.5 42 9 30 58 25 Lake Elsinore 60 55 0.4 29 9 15 51 26 Temecula Vly 51 47 0.3 34 7 15 44 27 Anza Vly 55 48 0.3 36 5 15 44 28 Hemet/San Jacinto 57 56 0.4 39 6 30 54 29 Banning 62 56 0.4 36 5 25 54 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 54 0.2 40 8 15 50 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 50 46 0.2 32 5 14 43 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 81 68 0.7 38 11 25 93 33 SW San Bernardino Vly 75 64 0.6 50 12 28 80 34 C San Bernardino Vly 87 72 0.5 46 9 37 105 35 E San Bernardino Vly 80 72 0.5 44 7 34 105 36 W San Bernardino Mtns 75 64 0.5 37 7 31 80 37 C San Bernardino Mtns 71 62 0.5 43 5 36 74 38 Big Bear Lake 63 59 0.4 40 5 33 64 San Bernardino County: Mojave Desert Air Basin 39 Phelan 58 53 0.4 31 5 32 49 40 Hesperia 62 56 0.4 26 7 36 54 41 Trona 51 47 0.2 34 5 26 44 42 Victorville 64 59 0.4 33 8 35 64 43 Yucca Vly 55 52 0.3 34 5 24 48 44 Barstow 67 58 0.3 40 7 47 61 45 Twentynine Palms 54 53 0.2 33 6 22 49 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SAT., SEP. 26, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 44 Ozone Central Mojave Desert AQI: 49 Ozone Coachella Valley/Low Desert AQI: 50 Ozone San Gabriel Mountains AQI: 50 Ozone Temecula/Anza Area AQI: 44 Ozone MODERATE in the following area(s): Banning Pass Area AQI: 54 Ozone Big Bear Lake AQI: 64 Ozone Coastal Area AQI: 56 PM2.5 Hemet/Elsinore Area AQI: 58 Ozone Inland Orange County AQI: 61 Ozone Metropolitan Area AQI: 55 PM2.5 Northern Mojave Desert AQI: 61 Ozone Riverside Valley AQI: 87 Ozone San Bernardino Mountains AQI: 80 Ozone San Fernando/Santa Clarita Valleys AQI: 54 Ozone San Gabriel Valley AQI: 80 Ozone Victor Valley AQI: 64 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): San Bernardino Valley AQI: 105 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures are forecast to remain about the same on Saturday as they have been on Thursday and Friday. Marine clouds are expected to last through the morning. Inversion Base: 1514 FT | Breaking Temperature: 86 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1856 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 34, 35 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 SATURDAY, SEPTEMBER 26, 2026 IN THE SOUTH COAST AIR BASIN.