SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., SEP. 04, 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 51 45 0.6 22 10 21 53 2 NW Coastal LA 42 38 0.3 21 8 17 44 3 SW Coastal LA 39 35 0.2 21 7 10 39 4 S Coastal LA 38 36 0.2 20 7 15 39 5 Southeast LA Co 43 39 0.5 21 8 20 44 6 W San Fernando Vly 58 51 0.3 20 7 10 47 7 E San Fernando Vly 57 52 0.5 22 10 17 53 8 W San Gabriel Vly 63 50 0.4 23 10 13 53 9 E San Gabriel Vly 66 54 0.4 25 10 18 53 10 Pomona Walnut Vly 62 51 0.3 34 10 16 53 11 S San Gabriel Vly 50 44 0.3 23 9 19 50 12 S Central LA Co 38 36 0.3 21 9 19 50 13 Santa Clarita Vly 67 57 0.2 21 9 16 58 15 San Gabriel Mts 61 52 0.3 33 9 16 50 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 61 57 0.2 22 10 16 58 Orange County: South Coast Air Basin 16 N Orange Co 44 38 0.1 26 8 11 44 17 Central Orange Co 40 35 0.3 16 8 16 44 18 N Coastal Orange Co 39 37 0.2 18 5 15 34 19 Saddleback Vly 44 40 0.2 26 5 14 37 20 Central Coastal 40 38 0.2 17 5 13 35 21 Capistrano Vly 40 36 0.3 22 6 11 33 Riverside County: South Coast Air Basin 22 Norco/Corona 56 48 0.4 37 9 13 50 23 Metro Riverside Co 66 53 0.6 40 10 11 53 24 Perris Vly 60 54 0.4 37 8 15 50 25 Lake Elsinore 47 41 0.3 17 8 10 44 26 Temecula Vly 46 41 0.3 29 6 11 38 27 Anza Vly 50 45 0.2 33 7 12 42 28 Hemet/San Jacinto 52 49 0.3 35 5 15 45 29 Banning 57 54 0.2 33 5 13 50 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 62 57 0.2 42 8 13 58 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 46 44 0.1 27 11 11 55 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 63 51 0.3 39 11 18 55 33 SW San Bernardino Vly 60 49 0.3 38 10 19 53 34 C San Bernardino Vly 72 61 0.3 43 9 22 71 35 E San Bernardino Vly 70 61 0.5 40 8 17 71 36 W San Bernardino Mtns 64 53 0.3 35 8 18 49 37 C San Bernardino Mtns 75 62 0.2 41 5 18 74 38 Big Bear Lake 59 54 0.2 37 7 18 50 San Bernardino County: Mojave Desert Air Basin 39 Phelan 58 53 0.2 27 5 14 49 40 Hesperia 64 55 0.2 26 7 16 51 41 Trona 54 52 0.2 41 5 24 48 42 Victorville 67 58 0.2 27 8 12 61 43 Yucca Vly 60 53 0.2 28 11 16 55 44 Barstow 61 57 0.2 28 9 26 58 45 Twentynine Palms 52 50 0.2 27 12 15 56 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., SEP. 04, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 50 Ozone Big Bear Lake AQI: 50 Ozone Coastal Area AQI: 44 PM2.5 Hemet/Elsinore Area AQI: 50 Ozone Inland Orange County AQI: 44 PM2.5 San Gabriel Mountains AQI: 50 PM2.5 Temecula/Anza Area AQI: 42 Ozone MODERATE in the following area(s): Antelope Valley AQI: 58 Ozone Central Mojave Desert AQI: 56 PM2.5 Coachella Valley/Low Desert AQI: 58 Ozone Metropolitan Area AQI: 53 PM2.5 Northern Mojave Desert AQI: 58 Ozone Riverside Valley AQI: 53 PM2.5 San Bernardino Mountains AQI: 74 Ozone San Bernardino Valley AQI: 71 Ozone San Fernando/Santa Clarita Valleys AQI: 58 Ozone San Gabriel Valley AQI: 53 PM2.5 Victor Valley AQI: 61 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Cooler temperatures will persist with night and morning clouds along the coast and western valleys. Onshore flow is expected. Inversion Base: 2247 FT | Breaking Temperature: 77 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 3123 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 FRIDAY, SEPTEMBER 04, 2026 IN THE SOUTH COAST AIR BASIN.