SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., APR. 17, 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 54 51 0.4 35 10 38 53 2 NW Coastal LA 50 47 0.5 32 9 28 50 3 SW Coastal LA 48 46 0.5 34 9 31 50 4 S Coastal LA 52 51 0.7 38 9 37 50 5 Southeast LA Co 55 51 0.9 39 9 35 50 6 W San Fernando Vly 55 52 0.5 29 7 19 48 7 E San Fernando Vly 58 54 0.5 34 8 31 50 8 W San Gabriel Vly 57 54 0.5 33 8 26 50 9 E San Gabriel Vly 67 58 0.5 25 4 25 61 10 Pomona Walnut Vly 66 57 0.6 39 8 34 58 11 S San Gabriel Vly 58 53 0.5 38 9 34 50 12 S Central LA Co 52 50 0.9 36 10 32 53 13 Santa Clarita Vly 56 53 0.3 28 5 20 49 15 San Gabriel Mts 56 52 0.4 32 5 26 48 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 56 51 0.4 23 9 26 50 Orange County: South Coast Air Basin 16 N Orange Co 59 54 0.4 43 9 22 50 17 Central Orange Co 50 46 0.6 41 9 24 50 18 N Coastal Orange Co 55 52 0.6 37 6 32 48 19 Saddleback Vly 57 54 0.3 43 5 24 50 20 Central Coastal 56 53 0.4 33 6 22 49 21 Capistrano Vly 57 54 0.3 31 6 17 50 Riverside County: South Coast Air Basin 22 Norco/Corona 61 56 0.5 50 8 27 54 23 Metro Riverside Co 64 58 0.4 56 10 30 61 24 Perris Vly 56 52 0.4 38 8 28 48 25 Lake Elsinore 58 55 0.3 26 6 14 51 26 Temecula Vly 53 49 0.3 41 6 13 45 27 Anza Vly 55 52 0.2 49 6 11 48 28 Hemet/San Jacinto 54 51 0.4 38 6 29 47 29 Banning 55 52 0.4 34 3 30 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 57 51 0.2 62 12 8 56 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 50 48 0.2 39 7 10 44 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 66 57 0.4 19 8 28 58 33 SW San Bernardino Vly 64 56 0.5 50 10 32 54 34 C San Bernardino Vly 59 56 0.5 37 7 33 54 35 E San Bernardino Vly 61 56 0.5 40 6 29 54 36 W San Bernardino Mtns 60 53 0.5 32 5 30 49 37 C San Bernardino Mtns 57 53 0.5 40 5 31 49 38 Big Bear Lake 54 51 0.5 36 7 29 47 San Bernardino County: Mojave Desert Air Basin 39 Phelan 49 48 0.4 36 4 30 44 40 Hesperia 49 47 0.5 42 5 32 44 41 Trona 53 46 0.2 16 3 11 43 42 Victorville 52 49 0.4 40 6 31 45 43 Yucca Vly 52 48 0.3 40 6 20 44 44 Barstow 53 51 0.3 22 4 45 47 45 Twentynine Palms 53 49 0.2 39 7 18 45 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., APR. 17, 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: 47 Ozone Central Mojave Desert AQI: 45 Ozone Coastal Area AQI: 50 PM2.5 Inland Orange County AQI: 50 PM2.5 Northern Mojave Desert AQI: 47 Ozone San Bernardino Mountains AQI: 49 Ozone San Fernando/Santa Clarita Valleys AQI: 50 Ozone San Gabriel Mountains AQI: 48 Ozone Temecula/Anza Area AQI: 48 Ozone Victor Valley AQI: 45 Ozone MODERATE in the following area(s): Coachella Valley/Low Desert AQI: 56 PM2.5 Hemet/Elsinore Area AQI: 51 Ozone Metropolitan Area AQI: 53 PM2.5 Riverside Valley AQI: 61 Ozone San Bernardino Valley AQI: 58 Ozone San Gabriel Valley AQI: 61 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Offshore flow is expected Friday, bringing warmer temperatures to the coast and valleys with gusty north winds of 35 to 45 mph near passes and coastal mountain slopes. Highs will be mostly in the 70s near the coast and valleys, near 80 inland, with lower to mid 80s in the deserts. Inversion Base: 3006 FT | Breaking Temperature: 66 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 7544 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 FRIDAY, APRIL 17, 2026 IN THE SOUTH COAST AIR BASIN.