SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., APR. 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 49 44 0.5 19 8 27 44 2 NW Coastal LA 50 45 0.4 18 6 23 42 3 SW Coastal LA 45 41 0.2 19 6 18 38 4 S Coastal LA 51 46 0.3 23 7 19 43 5 Southeast LA Co 50 44 0.4 24 8 30 44 6 W San Fernando Vly 50 46 0.4 16 6 22 43 7 E San Fernando Vly 53 47 0.4 19 6 25 44 8 W San Gabriel Vly 51 46 0.4 20 7 22 43 9 E San Gabriel Vly 53 46 0.3 19 6 28 43 10 Pomona Walnut Vly 51 44 0.5 26 7 34 41 11 S San Gabriel Vly 53 45 0.4 24 8 30 44 12 S Central LA Co 48 43 0.4 21 8 24 44 13 Santa Clarita Vly 49 44 0.3 18 5 18 41 15 San Gabriel Mts 50 45 0.4 25 6 23 42 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 52 47 0.3 18 9 9 50 Orange County: South Coast Air Basin 16 N Orange Co 54 46 0.2 26 8 21 44 17 Central Orange Co 43 39 0.4 26 7 29 39 18 N Coastal Orange Co 50 46 0.3 23 5 23 43 19 Saddleback Vly 52 47 0.2 24 4 27 44 20 Central Coastal 51 47 0.3 19 4 22 44 21 Capistrano Vly 50 46 0.3 35 4 20 43 Riverside County: South Coast Air Basin 22 Norco/Corona 54 48 0.4 29 8 27 44 23 Metro Riverside Co 58 50 0.6 30 9 24 50 24 Perris Vly 50 46 0.4 28 7 24 43 25 Lake Elsinore 50 47 0.3 11 6 20 44 26 Temecula Vly 49 45 0.3 62 6 17 54 27 Anza Vly 53 49 0.2 80 4 13 63 28 Hemet/San Jacinto 52 49 0.3 46 6 22 45 29 Banning 55 52 0.3 26 5 16 48 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 66 59 0.2 115 6 8 81 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 55 51 0.2 48 5 9 47 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 58 49 0.4 28 7 22 45 33 SW San Bernardino Vly 53 46 0.4 29 8 31 44 34 C San Bernardino Vly 54 48 0.4 19 7 32 44 35 E San Bernardino Vly 54 50 0.5 24 7 25 46 36 W San Bernardino Mtns 54 47 0.3 25 6 26 44 37 C San Bernardino Mtns 56 53 0.4 24 5 27 49 38 Big Bear Lake 54 48 0.3 32 4 23 44 San Bernardino County: Mojave Desert Air Basin 39 Phelan 44 41 0.3 23 5 21 38 40 Hesperia 50 47 0.3 21 6 25 44 41 Trona 53 46 0.2 43 6 19 43 42 Victorville 50 48 0.3 26 7 20 44 43 Yucca Vly 59 56 0.2 34 4 15 54 44 Barstow 58 55 0.3 36 6 31 51 45 Twentynine Palms 58 53 0.2 37 4 14 49 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., APR. 21, 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: 48 Ozone Big Bear Lake AQI: 44 Ozone Coastal Area AQI: 44 Ozone Hemet/Elsinore Area AQI: 45 Ozone Inland Orange County AQI: 44 Ozone Metropolitan Area AQI: 44 PM2.5 Riverside Valley AQI: 50 PM2.5 San Bernardino Mountains AQI: 49 Ozone San Bernardino Valley AQI: 46 Ozone San Fernando/Santa Clarita Valleys AQI: 44 Ozone San Gabriel Mountains AQI: 42 Ozone San Gabriel Valley AQI: 44 PM2.5 Victor Valley AQI: 44 Ozone MODERATE in the following area(s): Central Mojave Desert AQI: 54 Ozone Coachella Valley/Low Desert AQI: 81 PM10 Northern Mojave Desert AQI: 51 Ozone Temecula/Anza Area AQI: 63 PM10 ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Partly cloudy skies becoming sunny with cooler temperatures are expected. Morning patchy fog in the coastal areas. Inversion Base: 2342 FT | Breaking Temperature: 67 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 3190 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 Above 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, APRIL 21, 2026 IN THE SOUTH COAST AIR BASIN.