SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., SEP. 16, 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 52 44 0.7 17 10 18 53 2 NW Coastal LA 42 39 0.3 17 8 15 44 3 SW Coastal LA 40 37 0.2 18 8 12 44 4 S Coastal LA 46 42 0.2 20 8 22 44 5 Southeast LA Co 48 42 0.5 21 9 19 50 6 W San Fernando Vly 53 47 0.3 17 9 14 50 7 E San Fernando Vly 56 50 0.5 18 10 15 53 8 W San Gabriel Vly 61 49 0.2 20 10 11 53 9 E San Gabriel Vly 62 53 0.3 23 11 16 55 10 Pomona Walnut Vly 60 53 0.3 31 11 20 55 11 S San Gabriel Vly 51 44 0.3 22 10 19 53 12 S Central LA Co 48 42 0.4 18 10 14 53 13 Santa Clarita Vly 61 55 0.2 18 10 12 53 15 San Gabriel Mts 59 53 0.3 31 10 24 53 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 58 56 0.2 21 11 31 55 Orange County: South Coast Air Basin 16 N Orange Co 48 43 0.1 26 9 12 50 17 Central Orange Co 42 39 0.3 21 8 15 44 18 N Coastal Orange Co 42 39 0.2 20 6 19 36 19 Saddleback Vly 47 43 0.2 25 6 14 40 20 Central Coastal 44 40 0.2 19 6 13 37 21 Capistrano Vly 44 40 0.2 20 7 10 39 Riverside County: South Coast Air Basin 22 Norco/Corona 57 50 0.4 32 10 16 53 23 Metro Riverside Co 65 54 0.7 34 12 15 56 24 Perris Vly 57 53 0.4 32 9 16 50 25 Lake Elsinore 47 44 0.2 15 8 8 44 26 Temecula Vly 47 43 0.2 25 8 9 44 27 Anza Vly 57 54 0.2 28 9 10 50 28 Hemet/San Jacinto 54 50 0.3 31 8 16 46 29 Banning 53 50 0.3 30 6 14 46 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 65 61 0.2 44 17 12 71 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 43 36 0.2 29 10 10 53 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 60 51 0.3 35 12 15 56 33 SW San Bernardino Vly 58 50 0.3 34 11 18 55 34 C San Bernardino Vly 71 61 0.3 37 11 20 71 35 E San Bernardino Vly 68 61 0.5 34 9 18 71 36 W San Bernardino Mtns 62 53 0.3 33 10 19 53 37 C San Bernardino Mtns 73 63 0.3 35 7 21 77 38 Big Bear Lake 54 53 0.3 34 6 20 49 San Bernardino County: Mojave Desert Air Basin 39 Phelan 63 59 0.2 28 6 21 64 40 Hesperia 66 59 0.3 28 8 22 64 41 Trona 55 52 0.2 33 7 52 49 42 Victorville 71 63 0.2 29 9 21 77 43 Yucca Vly 59 55 0.2 36 9 17 51 44 Barstow 64 57 0.2 35 10 33 58 45 Twentynine Palms 51 48 0.2 35 10 16 53 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., SEP. 16, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 46 Ozone Big Bear Lake AQI: 49 Ozone Coastal Area AQI: 44 PM2.5 Hemet/Elsinore Area AQI: 50 PM2.5 Inland Orange County AQI: 44 PM2.5 Temecula/Anza Area AQI: 50 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 55 PM2.5 Central Mojave Desert AQI: 53 PM2.5 Coachella Valley/Low Desert AQI: 71 Ozone Metropolitan Area AQI: 53 PM2.5 Northern Mojave Desert AQI: 58 Ozone Riverside Valley AQI: 56 PM2.5 San Bernardino Mountains AQI: 77 Ozone San Bernardino Valley AQI: 71 Ozone San Fernando/Santa Clarita Valleys AQI: 53 PM2.5 San Gabriel Mountains AQI: 53 PM2.5 San Gabriel Valley AQI: 55 PM2.5 Victor Valley AQI: 77 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures on Wednesday are forecast to be below average for this time of year with onshore flow and increasing night and morning low clouds for the coast and valleys. Inversion Base: 3052 FT | Breaking Temperature: 84 DEG F Inversion Breaking: NO | Maximum Mixing HEIGHT: 3868 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 WEDNESDAY, SEPTEMBER 16, 2026 IN THE SOUTH COAST AIR BASIN.