SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., SEP. 11, 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 60 53 0.6 34 12 29 56 2 NW Coastal LA 48 42 0.3 32 9 19 50 3 SW Coastal LA 39 35 0.7 33 9 11 50 4 S Coastal LA 48 41 0.3 33 9 21 50 5 Southeast LA Co 56 49 0.4 34 11 24 55 6 W San Fernando Vly 63 57 0.4 32 9 19 58 7 E San Fernando Vly 63 57 0.5 34 12 24 58 8 W San Gabriel Vly 68 60 0.3 36 13 19 67 9 E San Gabriel Vly 86 68 0.5 39 12 25 93 10 Pomona Walnut Vly 85 67 0.5 39 12 20 90 11 S San Gabriel Vly 62 54 0.3 37 11 20 55 12 S Central LA Co 56 48 0.3 33 10 20 53 13 Santa Clarita Vly 66 58 0.3 33 10 21 61 15 San Gabriel Mts 71 63 0.4 39 12 24 77 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 63 56 0.3 33 12 21 56 Orange County: South Coast Air Basin 16 N Orange Co 58 50 0.1 39 10 12 53 17 Central Orange Co 53 47 0.3 33 10 16 53 18 N Coastal Orange Co 45 40 0.3 32 6 19 37 19 Saddleback Vly 54 48 0.2 39 5 16 44 20 Central Coastal 49 43 0.3 32 6 16 40 21 Capistrano Vly 49 43 0.3 35 8 14 44 Riverside County: South Coast Air Basin 22 Norco/Corona 73 66 0.4 46 11 18 87 23 Metro Riverside Co 75 72 0.6 49 12 17 105 24 Perris Vly 76 65 0.4 41 10 20 84 25 Lake Elsinore 61 53 0.4 31 9 13 50 26 Temecula Vly 49 46 0.3 41 9 13 50 27 Anza Vly 58 54 0.2 45 6 13 50 28 Hemet/San Jacinto 67 58 0.3 37 9 20 61 29 Banning 70 61 0.3 34 7 16 71 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 76 65 0.2 53 7 12 84 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 40 38 0.2 38 5 12 35 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 76 68 0.3 35 13 27 93 33 SW San Bernardino Vly 77 66 0.4 46 12 28 87 34 C San Bernardino Vly 84 72 0.5 40 11 31 105 35 E San Bernardino Vly 83 71 0.5 44 9 22 101 36 W San Bernardino Mtns 84 72 0.4 35 13 28 105 37 C San Bernardino Mtns 93 74 0.3 37 8 27 112 38 Big Bear Lake 62 58 0.3 36 5 22 61 San Bernardino County: Mojave Desert Air Basin 39 Phelan 81 66 0.3 32 9 27 87 40 Hesperia 76 67 0.3 26 10 28 90 41 Trona 51 49 0.2 38 5 14 45 42 Victorville 78 69 0.3 28 10 29 97 43 Yucca Vly 59 54 0.2 35 5 14 50 44 Barstow 62 53 0.2 27 6 18 49 45 Twentynine Palms 63 56 0.2 36 6 13 54 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., SEP. 11, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Coastal Area AQI: 50 PM2.5 Northern Mojave Desert AQI: 49 Ozone Temecula/Anza Area AQI: 50 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 56 PM2.5 Banning Pass Area AQI: 71 Ozone Big Bear Lake AQI: 61 Ozone Central Mojave Desert AQI: 54 Ozone Coachella Valley/Low Desert AQI: 84 Ozone Hemet/Elsinore Area AQI: 84 Ozone Inland Orange County AQI: 53 PM2.5 Metropolitan Area AQI: 56 PM2.5 San Fernando/Santa Clarita Valleys AQI: 61 Ozone San Gabriel Mountains AQI: 77 Ozone San Gabriel Valley AQI: 93 Ozone Victor Valley AQI: 97 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 105 Ozone San Bernardino Mountains AQI: 112 Ozone San Bernardino Valley AQI: 105 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ The oppressive humidity courtesy of the outermost bands of Tropical Storm Marie will gradually dissipate. Friday will be mostly sunny, and temperatures will be 3-7 degrees cooler than Thursday. Afternoon onshore winds (mostly westerly) will gust to 25 mph. Inversion Base: 1494 FT | Breaking Temperature: 89 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2013 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 23, 34, 35, 36, 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 Above 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 11, 2026 IN THE SOUTH COAST AIR BASIN.