SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., OCT. 21, 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 40 38 0.9 33 9 23 50 2 NW Coastal LA 45 41 0.4 30 7 21 39 3 SW Coastal LA 41 36 0.2 31 7 26 39 4 S Coastal LA 42 38 0.5 30 8 25 44 5 Southeast LA Co 44 38 0.9 33 9 31 50 6 W San Fernando Vly 42 41 0.6 26 8 14 44 7 E San Fernando Vly 39 40 0.6 32 9 23 50 8 W San Gabriel Vly 46 41 0.4 33 9 24 50 9 E San Gabriel Vly 68 59 0.4 37 8 26 64 10 Pomona Walnut Vly 56 45 0.6 40 9 26 50 11 S San Gabriel Vly 44 37 0.6 35 9 25 50 12 S Central LA Co 44 39 0.9 31 10 31 53 13 Santa Clarita Vly 47 42 0.2 24 7 15 39 15 San Gabriel Mts 47 43 0.4 37 7 24 40 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 46 44 0.3 14 7 25 41 Orange County: South Coast Air Basin 16 N Orange Co 50 41 0.4 38 9 12 50 17 Central Orange Co 45 37 0.6 28 8 21 44 18 N Coastal Orange Co 46 40 0.5 29 5 23 37 19 Saddleback Vly 51 47 0.3 38 5 19 44 20 Central Coastal 49 44 0.3 32 5 18 41 21 Capistrano Vly 50 45 0.3 35 5 14 42 Riverside County: South Coast Air Basin 22 Norco/Corona 56 48 0.5 47 10 19 53 23 Metro Riverside Co 60 50 0.7 50 11 16 55 24 Perris Vly 57 50 0.5 47 8 21 46 25 Lake Elsinore 58 51 0.3 36 6 12 47 26 Temecula Vly 54 48 0.3 37 6 12 44 27 Anza Vly 57 51 0.3 40 6 12 47 28 Hemet/San Jacinto 58 50 0.3 44 6 21 46 29 Banning 57 50 0.3 43 5 15 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 56 51 0.2 42 8 13 47 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 42 38 0.2 29 5 12 35 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 62 51 0.5 41 9 16 50 33 SW San Bernardino Vly 58 47 0.5 47 10 22 53 34 C San Bernardino Vly 56 48 0.4 47 8 29 44 35 E San Bernardino Vly 60 54 0.5 48 7 26 50 36 W San Bernardino Mtns 60 51 0.3 38 7 29 47 37 C San Bernardino Mtns 58 49 0.3 44 5 33 45 38 Big Bear Lake 54 51 0.3 43 6 25 47 San Bernardino County: Mojave Desert Air Basin 39 Phelan 57 53 0.3 25 6 35 49 40 Hesperia 54 48 0.3 19 6 38 44 41 Trona 43 41 0.2 17 5 15 38 42 Victorville 53 48 0.3 21 7 39 44 43 Yucca Vly 53 50 0.2 35 6 17 46 44 Barstow 48 46 0.2 17 6 26 43 45 Twentynine Palms 45 43 0.2 32 5 15 40 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., OCT. 21, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 41 Ozone Banning Pass Area AQI: 46 Ozone Big Bear Lake AQI: 47 Ozone Central Mojave Desert AQI: 46 Ozone Coachella Valley/Low Desert AQI: 47 Ozone Coastal Area AQI: 44 PM2.5 Hemet/Elsinore Area AQI: 47 Ozone Inland Orange County AQI: 44 PM2.5 Northern Mojave Desert AQI: 43 Ozone San Bernardino Mountains AQI: 47 Ozone San Fernando/Santa Clarita Valleys AQI: 50 PM2.5 San Gabriel Mountains AQI: 40 Ozone Temecula/Anza Area AQI: 47 Ozone Victor Valley AQI: 49 Ozone MODERATE in the following area(s): Metropolitan Area AQI: 53 PM2.5 Riverside Valley AQI: 55 PM2.5 San Bernardino Valley AQI: 53 PM2.5 San Gabriel Valley AQI: 64 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ A low pressure system will spreading cooling. It is expected to bring showers and slight chance of thunderstorms for late Wednesday through Thursday. Inversion Base: 1523 FT | Breaking Temperature: 70 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2362 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, OCTOBER 21, 2026 IN THE SOUTH COAST AIR BASIN.