SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SAT., APR. 18, 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 62 56 0.6 33 11 44 55 2 NW Coastal LA 55 52 0.7 30 10 34 53 3 SW Coastal LA 52 48 0.6 31 9 40 50 4 S Coastal LA 57 52 0.7 30 8 44 48 5 Southeast LA Co 63 56 1.0 32 11 43 55 6 W San Fernando Vly 62 58 0.5 28 6 30 61 7 E San Fernando Vly 64 60 0.6 32 8 40 67 8 W San Gabriel Vly 64 58 0.4 31 9 38 61 9 E San Gabriel Vly 72 64 0.5 21 7 33 80 10 Pomona Walnut Vly 73 60 0.6 32 10 42 67 11 S San Gabriel Vly 65 57 0.7 32 11 43 58 12 S Central LA Co 60 54 1.0 31 10 41 53 13 Santa Clarita Vly 71 64 0.3 27 5 23 80 15 San Gabriel Mts 68 62 0.5 30 6 36 74 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 66 61 0.4 22 8 35 71 Orange County: South Coast Air Basin 16 N Orange Co 70 62 0.5 38 11 30 74 17 Central Orange Co 56 51 0.6 26 10 35 53 18 N Coastal Orange Co 59 55 0.6 27 6 40 51 19 Saddleback Vly 65 60 0.3 38 6 33 67 20 Central Coastal 62 58 0.4 25 6 28 61 21 Capistrano Vly 62 58 0.3 25 6 22 61 Riverside County: South Coast Air Basin 22 Norco/Corona 70 62 0.5 51 10 35 74 23 Metro Riverside Co 71 62 0.6 58 10 41 74 24 Perris Vly 63 58 0.5 41 7 35 61 25 Lake Elsinore 63 59 0.4 25 6 19 64 26 Temecula Vly 58 55 0.3 26 6 17 51 27 Anza Vly 60 57 0.3 28 3 16 58 28 Hemet/San Jacinto 61 58 0.5 36 4 30 61 29 Banning 65 61 0.5 32 3 26 71 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 64 61 0.2 42 4 15 71 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 53 50 0.2 28 3 12 46 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 81 65 0.5 25 7 29 84 33 SW San Bernardino Vly 72 60 0.6 50 10 39 67 34 C San Bernardino Vly 72 66 0.6 41 7 39 87 35 E San Bernardino Vly 68 63 0.6 44 5 38 77 36 W San Bernardino Mtns 73 64 0.5 29 6 34 80 37 C San Bernardino Mtns 68 62 0.6 39 5 35 74 38 Big Bear Lake 61 59 0.6 36 5 32 64 San Bernardino County: Mojave Desert Air Basin 39 Phelan 65 60 0.5 26 5 36 67 40 Hesperia 61 54 0.5 27 5 37 50 41 Trona 53 48 0.3 18 3 6 44 42 Victorville 61 55 0.5 27 6 37 51 43 Yucca Vly 60 58 0.3 33 3 24 61 44 Barstow 58 55 0.4 25 3 49 51 45 Twentynine Palms 55 52 0.3 31 3 21 48 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SAT., APR. 18, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... MODERATE in the following area(s): Antelope Valley AQI: 71 Ozone Banning Pass Area AQI: 71 Ozone Big Bear Lake AQI: 64 Ozone Central Mojave Desert AQI: 61 Ozone Coachella Valley/Low Desert AQI: 71 Ozone Coastal Area AQI: 61 Ozone Hemet/Elsinore Area AQI: 64 Ozone Inland Orange County AQI: 67 Ozone Metropolitan Area AQI: 74 Ozone Northern Mojave Desert AQI: 51 Ozone Riverside Valley AQI: 74 Ozone San Bernardino Mountains AQI: 80 Ozone San Bernardino Valley AQI: 87 Ozone San Fernando/Santa Clarita Valleys AQI: 80 Ozone San Gabriel Mountains AQI: 74 Ozone San Gabriel Valley AQI: 80 Ozone Temecula/Anza Area AQI: 58 Ozone Victor Valley AQI: 67 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Mostly sunny skies with slightly warm temperatures are expected. Inversion Base: 1570 FT | Breaking Temperature: 71 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 4095 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 SATURDAY, APRIL 18, 2026 IN THE SOUTH COAST AIR BASIN.