SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SUN., SEP. 27, 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 58 48 0.8 31 10 33 53 2 NW Coastal LA 50 41 0.6 30 9 23 50 3 SW Coastal LA 48 39 0.2 31 8 33 44 4 S Coastal LA 42 39 0.4 34 7 22 39 5 Southeast LA Co 51 43 0.8 35 8 28 44 6 W San Fernando Vly 64 56 0.5 29 10 19 54 7 E San Fernando Vly 56 47 0.7 31 10 26 53 8 W San Gabriel Vly 58 47 0.5 32 9 20 50 9 E San Gabriel Vly 68 56 0.6 30 8 27 54 10 Pomona Walnut Vly 65 56 0.7 40 9 34 54 11 S San Gabriel Vly 55 44 0.5 35 9 24 50 12 S Central LA Co 51 42 0.8 32 8 27 44 13 Santa Clarita Vly 70 56 0.4 30 8 15 54 15 San Gabriel Mts 63 53 0.6 35 8 23 49 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 58 54 0.5 32 10 14 53 Orange County: South Coast Air Basin 16 N Orange Co 59 49 0.2 41 8 17 45 17 Central Orange Co 52 44 0.4 36 8 25 44 18 N Coastal Orange Co 52 46 0.4 33 5 23 43 19 Saddleback Vly 58 53 0.3 41 4 25 49 20 Central Coastal 58 52 0.4 31 5 20 48 21 Capistrano Vly 58 53 0.4 28 6 17 49 Riverside County: South Coast Air Basin 22 Norco/Corona 60 53 0.7 50 8 29 49 23 Metro Riverside Co 64 57 0.7 54 10 29 58 24 Perris Vly 59 56 0.6 39 7 26 54 25 Lake Elsinore 51 46 0.4 26 7 15 43 26 Temecula Vly 58 54 0.4 29 5 16 50 27 Anza Vly 53 49 0.3 31 3 17 45 28 Hemet/San Jacinto 54 50 0.6 35 5 24 46 29 Banning 47 44 0.6 31 5 17 41 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 52 46 0.2 34 3 19 43 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 41 38 0.2 28 3 16 35 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 66 56 0.7 38 11 24 55 33 SW San Bernardino Vly 62 56 0.7 50 10 31 54 34 C San Bernardino Vly 62 56 0.7 41 9 35 54 35 E San Bernardino Vly 61 56 0.7 41 6 28 54 36 W San Bernardino Mtns 62 54 0.6 36 8 31 50 37 C San Bernardino Mtns 63 56 0.7 39 5 33 54 38 Big Bear Lake 54 52 0.7 35 3 28 48 San Bernardino County: Mojave Desert Air Basin 39 Phelan 59 56 0.6 31 5 31 54 40 Hesperia 56 51 0.6 27 6 34 47 41 Trona 55 51 0.3 33 5 20 47 42 Victorville 60 55 0.6 29 7 35 51 43 Yucca Vly 50 46 0.4 29 3 24 43 44 Barstow 64 58 0.4 28 7 40 61 45 Twentynine Palms 48 44 0.3 29 3 23 41 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SUN., SEP. 27, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Banning Pass Area AQI: 41 Ozone Big Bear Lake AQI: 48 Ozone Central Mojave Desert AQI: 43 Ozone Coachella Valley/Low Desert AQI: 43 Ozone Coastal Area AQI: 50 PM2.5 Inland Orange County AQI: 49 Ozone San Gabriel Mountains AQI: 49 Ozone Temecula/Anza Area AQI: 50 Ozone MODERATE in the following area(s): Antelope Valley AQI: 53 PM2.5 Hemet/Elsinore Area AQI: 54 Ozone Metropolitan Area AQI: 53 PM2.5 Northern Mojave Desert AQI: 61 Ozone Riverside Valley AQI: 58 Ozone San Bernardino Mountains AQI: 54 Ozone San Bernardino Valley AQI: 55 PM2.5 San Fernando/Santa Clarita Valleys AQI: 54 Ozone San Gabriel Valley AQI: 54 Ozone Victor Valley AQI: 54 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures are expected to drop multiple degrees tomorrow. Unusual meteorological conditions may lead to small amounts of rain throughout the region. Inversion Base: 486 FT | Breaking Temperature: 79 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1708 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 SUNDAY, SEPTEMBER 27, 2026 IN THE SOUTH COAST AIR BASIN.