SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: MON., APR. 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 60 54 0.5 31 9 30 50 2 NW Coastal LA 56 50 0.4 29 7 13 46 3 SW Coastal LA 51 46 0.4 30 7 21 43 4 S Coastal LA 55 50 0.2 30 7 17 46 5 Southeast LA Co 55 51 0.4 31 9 23 50 6 W San Fernando Vly 63 55 0.3 28 7 17 51 7 E San Fernando Vly 62 56 0.4 31 8 22 54 8 W San Gabriel Vly 64 57 0.3 31 10 13 58 9 E San Gabriel Vly 69 61 0.4 32 10 20 71 10 Pomona Walnut Vly 65 57 0.4 34 11 25 58 11 S San Gabriel Vly 58 54 0.4 31 11 18 55 12 S Central LA Co 56 50 0.4 30 9 11 50 13 Santa Clarita Vly 65 59 0.3 29 7 15 64 15 San Gabriel Mts 63 57 0.4 32 8 25 58 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 61 58 0.3 28 8 29 61 Orange County: South Coast Air Basin 16 N Orange Co 57 54 0.1 35 9 9 50 17 Central Orange Co 47 43 0.4 30 8 15 44 18 N Coastal Orange Co 50 47 0.3 29 5 16 44 19 Saddleback Vly 59 55 0.2 35 3 16 51 20 Central Coastal 54 51 0.2 27 3 14 47 21 Capistrano Vly 53 50 0.3 28 4 13 46 Riverside County: South Coast Air Basin 22 Norco/Corona 67 61 0.3 42 10 18 71 23 Metro Riverside Co 70 63 0.4 47 11 19 77 24 Perris Vly 66 63 0.4 35 10 21 77 25 Lake Elsinore 62 58 0.3 23 9 13 61 26 Temecula Vly 51 49 0.3 33 7 13 45 27 Anza Vly 63 59 0.2 37 5 12 64 28 Hemet/San Jacinto 62 58 0.4 34 7 23 61 29 Banning 67 62 0.3 34 7 23 74 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 68 64 0.2 43 8 10 80 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 62 56 0.2 33 5 11 54 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 69 62 0.5 28 10 20 74 33 SW San Bernardino Vly 64 58 0.4 42 11 23 61 34 C San Bernardino Vly 70 61 0.4 37 9 21 71 35 E San Bernardino Vly 72 64 0.4 36 9 24 80 36 W San Bernardino Mtns 67 61 0.4 32 9 22 71 37 C San Bernardino Mtns 71 63 0.4 36 6 27 77 38 Big Bear Lake 68 64 0.4 35 5 28 80 San Bernardino County: Mojave Desert Air Basin 39 Phelan 62 59 0.4 32 5 27 64 40 Hesperia 68 63 0.4 33 7 30 77 41 Trona 62 58 0.2 40 4 14 61 42 Victorville 65 62 0.3 33 8 27 74 43 Yucca Vly 71 68 0.3 36 5 23 93 44 Barstow 72 69 0.3 35 7 53 97 45 Twentynine Palms 62 61 0.2 35 6 21 71 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON MON., APR. 20, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Coastal Area AQI: 47 Ozone Metropolitan Area AQI: 50 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 61 Ozone Banning Pass Area AQI: 74 Ozone Big Bear Lake AQI: 80 Ozone Central Mojave Desert AQI: 93 Ozone Coachella Valley/Low Desert AQI: 80 Ozone Hemet/Elsinore Area AQI: 77 Ozone Inland Orange County AQI: 51 Ozone Northern Mojave Desert AQI: 97 Ozone Riverside Valley AQI: 77 Ozone San Bernardino Mountains AQI: 77 Ozone San Bernardino Valley AQI: 80 Ozone San Fernando/Santa Clarita Valleys AQI: 64 Ozone San Gabriel Mountains AQI: 58 Ozone San Gabriel Valley AQI: 71 Ozone Temecula/Anza Area AQI: 64 Ozone Victor Valley AQI: 77 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Persistent good ventilation during the day in the basin. Low pressure systembringing cooler temperatures and windy conditions on Monday. Inversion Base: 1591 FT | Breaking Temperature: 65 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 3049 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 MONDAY, APRIL 20, 2026 IN THE SOUTH COAST AIR BASIN.