SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., OCT. 20, 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 49 0.6 34 12 34 56 2 NW Coastal LA 51 47 0.4 32 9 23 50 3 SW Coastal LA 46 42 0.3 32 8 17 44 4 S Coastal LA 50 43 0.3 30 8 32 44 5 Southeast LA Co 54 47 0.7 31 10 30 53 6 W San Fernando Vly 57 53 0.5 30 10 26 53 7 E San Fernando Vly 60 53 0.5 34 11 30 55 8 W San Gabriel Vly 59 51 0.4 34 11 26 55 9 E San Gabriel Vly 61 51 0.5 30 10 35 53 10 Pomona Walnut Vly 63 52 0.6 34 11 39 55 11 S San Gabriel Vly 56 47 0.7 32 11 27 55 12 S Central LA Co 53 47 0.5 32 10 24 53 13 Santa Clarita Vly 62 55 0.4 32 10 27 53 15 San Gabriel Mts 60 53 0.5 34 9 31 50 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 55 50 0.4 34 9 32 50 Orange County: South Coast Air Basin 16 N Orange Co 54 48 0.4 33 10 21 53 17 Central Orange Co 48 43 0.5 19 9 23 50 18 N Coastal Orange Co 48 44 0.3 24 5 29 41 19 Saddleback Vly 49 47 0.2 33 5 27 44 20 Central Coastal 50 46 0.3 27 5 25 43 21 Capistrano Vly 50 47 0.3 30 5 25 44 Riverside County: South Coast Air Basin 22 Norco/Corona 57 51 0.5 46 12 30 56 23 Metro Riverside Co 64 54 0.6 50 15 35 62 24 Perris Vly 55 50 0.5 42 8 34 46 25 Lake Elsinore 53 50 0.3 31 8 25 46 26 Temecula Vly 54 48 0.3 30 6 23 44 27 Anza Vly 51 48 0.2 29 5 22 44 28 Hemet/San Jacinto 57 52 0.5 38 6 36 48 29 Banning 53 50 0.4 35 6 38 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 60 54 0.2 36 5 20 50 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 41 39 0.2 26 5 19 36 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 81 54 0.6 32 11 26 55 33 SW San Bernardino Vly 65 52 0.6 45 13 34 58 34 C San Bernardino Vly 61 53 0.6 42 10 38 53 35 E San Bernardino Vly 56 54 0.6 44 7 36 50 36 W San Bernardino Mtns 68 54 0.5 34 9 34 50 37 C San Bernardino Mtns 62 58 0.6 40 5 37 61 38 Big Bear Lake 57 55 0.5 38 5 36 51 San Bernardino County: Mojave Desert Air Basin 39 Phelan 59 54 0.5 31 6 37 50 40 Hesperia 57 53 0.5 29 7 39 49 41 Trona 50 48 0.2 29 7 16 44 42 Victorville 55 52 0.5 30 8 39 48 43 Yucca Vly 55 51 0.3 30 5 27 47 44 Barstow 57 52 0.4 23 9 44 50 45 Twentynine Palms 52 48 0.2 29 5 25 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., OCT. 20, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 50 PM2.5 Banning Pass Area AQI: 46 Ozone Central Mojave Desert AQI: 47 Ozone Coachella Valley/Low Desert AQI: 50 Ozone Coastal Area AQI: 50 PM2.5 Hemet/Elsinore Area AQI: 48 Ozone Inland Orange County AQI: 50 PM2.5 Northern Mojave Desert AQI: 50 PM2.5 San Gabriel Mountains AQI: 50 PM2.5 Temecula/Anza Area AQI: 44 Ozone Victor Valley AQI: 50 Ozone MODERATE in the following area(s): Big Bear Lake AQI: 51 Ozone Metropolitan Area AQI: 56 PM2.5 Riverside Valley AQI: 62 PM2.5 San Bernardino Mountains AQI: 61 Ozone San Bernardino Valley AQI: 58 PM2.5 San Fernando/Santa Clarita Valleys AQI: 55 PM2.5 San Gabriel Valley AQI: 55 PM2.5 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Onshore flow on Tuesday. Increasing ventilation rates in the basin. Light winds. Decreasing Temperatures. Inversion Base: 486 FT | Breaking Temperature: 70 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1730 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, OCTOBER 20, 2026 IN THE SOUTH COAST AIR BASIN.