SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., SEP. 15, 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 55 46 0.8 26 12 17 56 2 NW Coastal LA 47 42 0.3 24 10 13 53 3 SW Coastal LA 43 38 0.1 25 10 10 53 4 S Coastal LA 47 42 0.2 23 9 14 50 5 Southeast LA Co 48 42 0.5 24 11 17 55 6 W San Fernando Vly 53 47 0.2 23 11 11 55 7 E San Fernando Vly 60 52 0.5 26 11 14 55 8 W San Gabriel Vly 58 46 0.3 26 11 10 55 9 E San Gabriel Vly 56 50 0.4 24 11 17 55 10 Pomona Walnut Vly 61 53 0.3 33 12 18 56 11 S San Gabriel Vly 51 44 0.3 25 11 17 55 12 S Central LA Co 49 42 0.2 25 11 14 55 13 Santa Clarita Vly 71 59 0.2 24 11 14 64 15 San Gabriel Mts 62 54 0.3 33 11 25 55 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 62 58 0.2 24 12 31 61 Orange County: South Coast Air Basin 16 N Orange Co 45 40 0.1 27 10 12 53 17 Central Orange Co 45 41 0.3 17 9 10 50 18 N Coastal Orange Co 44 40 0.2 19 6 13 37 19 Saddleback Vly 47 43 0.2 27 6 11 40 20 Central Coastal 45 41 0.2 21 6 10 38 21 Capistrano Vly 43 40 0.2 26 8 9 44 Riverside County: South Coast Air Basin 22 Norco/Corona 58 50 0.4 37 12 13 56 23 Metro Riverside Co 65 53 0.7 40 13 12 58 24 Perris Vly 61 56 0.4 32 10 18 54 25 Lake Elsinore 48 44 0.2 21 10 9 53 26 Temecula Vly 44 41 0.2 33 9 10 50 27 Anza Vly 59 54 0.2 39 8 11 50 28 Hemet/San Jacinto 57 51 0.3 33 9 19 50 29 Banning 64 53 0.2 32 6 18 49 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 74 60 0.2 48 13 13 67 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 39 35 0.2 33 8 12 44 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 69 59 0.3 38 14 15 64 33 SW San Bernardino Vly 62 52 0.3 38 13 18 58 34 C San Bernardino Vly 69 59 0.2 34 11 21 64 35 E San Bernardino Vly 64 59 0.5 33 9 22 64 36 W San Bernardino Mtns 68 58 0.3 34 11 23 61 37 C San Bernardino Mtns 78 67 0.2 34 7 26 90 38 Big Bear Lake 56 53 0.2 35 6 27 49 San Bernardino County: Mojave Desert Air Basin 39 Phelan 66 62 0.2 30 7 29 74 40 Hesperia 70 60 0.2 30 8 30 67 41 Trona 58 54 0.2 34 7 50 50 42 Victorville 76 65 0.2 32 10 31 84 43 Yucca Vly 60 55 0.2 37 8 22 51 44 Barstow 64 59 0.2 36 12 46 64 45 Twentynine Palms 47 44 0.2 36 8 20 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., SEP. 15, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 49 Ozone Big Bear Lake AQI: 49 Ozone Inland Orange County AQI: 50 PM2.5 Temecula/Anza Area AQI: 50 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 61 Ozone Central Mojave Desert AQI: 51 Ozone Coachella Valley/Low Desert AQI: 67 Ozone Coastal Area AQI: 53 PM2.5 Hemet/Elsinore Area AQI: 54 Ozone Metropolitan Area AQI: 56 PM2.5 Northern Mojave Desert AQI: 64 Ozone Riverside Valley AQI: 58 PM2.5 San Bernardino Mountains AQI: 90 Ozone San Bernardino Valley AQI: 64 Ozone San Fernando/Santa Clarita Valleys AQI: 64 Ozone San Gabriel Mountains AQI: 55 PM2.5 San Gabriel Valley AQI: 56 PM2.5 Victor Valley AQI: 84 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures on Tuesday are forecast to be below average for this time of year with increasing coastal night and morning low clouds. Inversion Base: 2247 FT | Breaking Temperature: 82 DEG F Inversion Breaking: NO | Maximum Mixing HEIGHT: 3271 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 TUESDAY, SEPTEMBER 15, 2026 IN THE SOUTH COAST AIR BASIN.