SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: MON., SEP. 28, 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 59 48 0.4 32 11 34 55 2 NW Coastal LA 50 43 0.6 31 8 22 44 3 SW Coastal LA 48 40 0.3 32 8 25 44 4 S Coastal LA 55 44 0.3 35 8 25 44 5 Southeast LA Co 59 45 0.5 36 10 28 52 6 W San Fernando Vly 57 50 0.7 29 6 22 46 7 E San Fernando Vly 59 51 0.6 32 8 29 47 8 W San Gabriel Vly 59 49 0.3 34 9 26 50 9 E San Gabriel Vly 66 56 0.4 37 9 28 54 10 Pomona Walnut Vly 66 55 0.6 41 9 34 51 11 S San Gabriel Vly 62 48 0.4 37 10 24 53 12 S Central LA Co 56 43 0.5 34 10 17 53 13 Santa Clarita Vly 75 58 0.3 28 5 22 61 15 San Gabriel Mts 63 53 0.5 37 7 27 49 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 54 49 0.4 25 7 23 45 Orange County: South Coast Air Basin 16 N Orange Co 59 48 0.3 42 8 15 44 17 Central Orange Co 56 45 0.5 37 7 17 42 18 N Coastal Orange Co 53 44 0.3 35 5 23 41 19 Saddleback Vly 48 43 0.2 42 4 21 40 20 Central Coastal 51 44 0.3 33 5 19 41 21 Capistrano Vly 50 45 0.3 31 5 18 42 Riverside County: South Coast Air Basin 22 Norco/Corona 59 53 0.5 50 8 25 49 23 Metro Riverside Co 63 56 0.5 54 10 33 54 24 Perris Vly 56 51 0.5 40 7 30 47 25 Lake Elsinore 51 48 0.3 29 7 18 44 26 Temecula Vly 44 42 0.2 34 6 16 39 27 Anza Vly 47 45 0.2 37 4 14 42 28 Hemet/San Jacinto 49 46 0.4 34 6 25 43 29 Banning 49 46 0.4 32 5 18 43 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 54 48 0.2 42 4 11 44 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 46 39 0.2 32 4 12 36 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 65 56 0.5 36 8 29 54 33 SW San Bernardino Vly 62 54 0.5 50 9 32 50 34 C San Bernardino Vly 66 57 0.5 37 8 36 58 35 E San Bernardino Vly 64 56 0.5 42 7 31 54 36 W San Bernardino Mtns 64 56 0.5 37 7 33 54 37 C San Bernardino Mtns 68 56 0.5 37 5 35 54 38 Big Bear Lake 59 54 0.5 35 4 27 50 San Bernardino County: Mojave Desert Air Basin 39 Phelan 61 56 0.4 35 5 35 54 40 Hesperia 55 48 0.5 37 6 37 44 41 Trona 50 46 0.3 30 4 14 43 42 Victorville 58 53 0.4 36 7 38 49 43 Yucca Vly 55 50 0.3 31 4 18 46 44 Barstow 53 52 0.4 35 5 35 48 45 Twentynine Palms 50 45 0.3 31 4 17 42 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON MON., SEP. 28, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 45 Ozone Banning Pass Area AQI: 43 Ozone Big Bear Lake AQI: 50 Ozone Central Mojave Desert AQI: 46 Ozone Coachella Valley/Low Desert AQI: 44 Ozone Coastal Area AQI: 44 PM2.5 Hemet/Elsinore Area AQI: 47 Ozone Inland Orange County AQI: 42 Ozone Northern Mojave Desert AQI: 48 Ozone San Gabriel Mountains AQI: 49 Ozone Temecula/Anza Area AQI: 42 Ozone MODERATE in the following area(s): Metropolitan Area AQI: 55 PM2.5 Riverside Valley AQI: 54 Ozone San Bernardino Mountains AQI: 54 Ozone San Bernardino Valley AQI: 58 Ozone San Fernando/Santa Clarita Valleys AQI: 61 Ozone San Gabriel Valley AQI: 54 Ozone Victor Valley AQI: 54 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Cool weather and a strong marine layer will continue on Monday. Hurricanse to the south may bring moist air and showers to eastern LA County and the Coachella Valley. Inversion Base: 1468 FT | Breaking Temperature: 79 DEG F Inversion Breaking: NO | Maximum Mixing HEIGHT: 1828 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 MONDAY, SEPTEMBER 28, 2026 IN THE SOUTH COAST AIR BASIN.