SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., SEP. 09, 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 76 63 0.6 34 12 37 77 2 NW Coastal LA 56 48 0.4 31 10 19 53 3 SW Coastal LA 41 36 0.3 33 8 15 44 4 S Coastal LA 54 43 0.8 39 7 39 40 5 Southeast LA Co 75 57 0.6 40 10 33 58 6 W San Fernando Vly 80 68 0.5 29 6 30 93 7 E San Fernando Vly 75 63 0.5 33 9 31 77 8 W San Gabriel Vly 83 70 0.4 34 10 25 100 9 E San Gabriel Vly 89 72 0.7 30 8 34 105 10 Pomona Walnut Vly 84 69 0.6 44 11 44 97 11 S San Gabriel Vly 90 67 0.5 39 11 32 90 12 S Central LA Co 63 50 0.5 36 9 26 50 13 Santa Clarita Vly 84 66 0.3 29 7 25 87 15 San Gabriel Mts 79 67 0.4 32 8 31 90 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 58 52 0.3 26 11 29 55 Orange County: South Coast Air Basin 16 N Orange Co 86 67 0.4 47 10 19 90 17 Central Orange Co 68 54 0.6 41 10 25 53 18 N Coastal Orange Co 50 39 0.7 38 5 34 36 19 Saddleback Vly 69 57 0.2 47 5 29 58 20 Central Coastal 53 41 0.4 34 5 26 38 21 Capistrano Vly 57 45 0.4 32 7 23 42 Riverside County: South Coast Air Basin 22 Norco/Corona 77 69 0.5 58 12 35 97 23 Metro Riverside Co 77 68 0.6 65 13 48 93 24 Perris Vly 82 66 0.5 41 11 41 87 25 Lake Elsinore 73 60 0.4 27 8 24 67 26 Temecula Vly 63 52 0.3 41 9 20 50 27 Anza Vly 71 63 0.3 47 6 16 77 28 Hemet/San Jacinto 78 62 0.4 34 8 37 74 29 Banning 75 64 0.4 30 5 36 80 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 73 61 0.2 60 7 11 71 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 36 35 0.2 37 5 12 34 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 79 67 0.5 34 12 34 90 33 SW San Bernardino Vly 80 69 0.5 58 13 41 97 34 C San Bernardino Vly 92 73 0.5 40 10 46 108 35 E San Bernardino Vly 87 73 0.5 43 9 44 108 36 W San Bernardino Mtns 78 66 0.4 33 7 39 87 37 C San Bernardino Mtns 90 69 0.4 37 6 39 97 38 Big Bear Lake 61 52 0.4 34 5 37 48 San Bernardino County: Mojave Desert Air Basin 39 Phelan 64 59 0.4 25 5 36 64 40 Hesperia 54 52 0.4 20 7 38 48 41 Trona 48 41 0.3 17 5 9 38 42 Victorville 59 57 0.4 27 8 38 58 43 Yucca Vly 48 42 0.3 35 5 21 39 44 Barstow 53 48 0.3 35 5 44 44 45 Twentynine Palms 38 37 0.3 36 5 19 34 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., SEP. 09, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Big Bear Lake AQI: 48 Ozone Central Mojave Desert AQI: 39 Ozone Northern Mojave Desert AQI: 44 Ozone MODERATE in the following area(s): Antelope Valley AQI: 55 PM2.5 Banning Pass Area AQI: 80 Ozone Coachella Valley/Low Desert AQI: 71 Ozone Coastal Area AQI: 53 PM2.5 Hemet/Elsinore Area AQI: 87 Ozone Inland Orange County AQI: 58 Ozone Metropolitan Area AQI: 90 Ozone Riverside Valley AQI: 97 Ozone San Bernardino Mountains AQI: 97 Ozone San Fernando/Santa Clarita Valleys AQI: 93 Ozone San Gabriel Mountains AQI: 90 Ozone Temecula/Anza Area AQI: 77 Ozone Victor Valley AQI: 64 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): San Bernardino Valley AQI: 108 Ozone San Gabriel Valley AQI: 105 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures on Wednesday will be 1-4 degrees warmer than Tuesday and 10-15 degrees above normal. Higher-than-normal humidity will make it uncomfortable. Skies will be mostly sunny except over the mountains, and winds will be mostly light to moderate. Inversion Base: 486 FT | Breaking Temperature: 90 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1254 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 WEDNESDAY, SEPTEMBER 09, 2026 IN THE SOUTH COAST AIR BASIN.