SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: MON., AUG. 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 62 52 0.5 24 10 23 53 2 NW Coastal LA 49 41 0.4 24 9 15 50 3 SW Coastal LA 45 36 0.2 26 7 10 39 4 S Coastal LA 46 40 0.2 30 7 18 39 5 Southeast LA Co 53 47 0.5 32 9 20 50 6 W San Fernando Vly 67 58 0.4 25 8 15 61 7 E San Fernando Vly 62 54 0.4 25 10 19 53 8 W San Gabriel Vly 68 62 0.4 29 11 15 74 9 E San Gabriel Vly 92 76 0.5 35 10 23 118 10 Pomona Walnut Vly 85 71 0.4 40 11 28 101 11 S San Gabriel Vly 61 55 0.5 34 10 20 53 12 S Central LA Co 49 42 0.3 27 8 14 44 13 Santa Clarita Vly 65 57 0.3 26 8 18 58 15 San Gabriel Mts 67 61 0.4 36 9 25 71 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 66 57 0.3 30 10 26 58 Orange County: South Coast Air Basin 16 N Orange Co 57 55 0.2 42 9 11 51 17 Central Orange Co 47 43 0.3 33 9 11 50 18 N Coastal Orange Co 44 38 0.3 34 4 16 35 19 Saddleback Vly 55 48 0.2 42 4 14 44 20 Central Coastal 49 42 0.3 36 4 13 39 21 Capistrano Vly 51 45 0.3 40 5 12 42 Riverside County: South Coast Air Basin 22 Norco/Corona 78 66 0.3 49 9 17 87 23 Metro Riverside Co 90 74 0.4 52 11 21 112 24 Perris Vly 81 67 0.4 40 9 23 90 25 Lake Elsinore 68 63 0.3 40 8 12 77 26 Temecula Vly 49 46 0.3 38 8 12 44 27 Anza Vly 56 51 0.2 36 6 12 47 28 Hemet/San Jacinto 68 61 0.3 37 7 25 71 29 Banning 77 65 0.3 31 5 23 84 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 70 65 0.2 44 8 11 84 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 43 40 0.2 32 4 12 37 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 83 71 0.5 39 12 24 101 33 SW San Bernardino Vly 82 71 0.4 49 11 29 101 34 C San Bernardino Vly 87 74 0.4 33 10 35 112 35 E San Bernardino Vly 92 77 0.4 36 9 27 122 36 W San Bernardino Mtns 77 67 0.4 36 8 35 90 37 C San Bernardino Mtns 88 73 0.3 32 6 39 108 38 Big Bear Lake 70 60 0.3 31 4 29 67 San Bernardino County: Mojave Desert Air Basin 39 Phelan 63 55 0.3 30 5 44 51 40 Hesperia 66 55 0.3 25 7 46 51 41 Trona 51 46 0.2 27 5 17 43 42 Victorville 70 55 0.3 28 8 48 51 43 Yucca Vly 64 57 0.2 34 6 20 58 44 Barstow 62 54 0.3 29 8 41 50 45 Twentynine Palms 60 54 0.2 34 7 19 50 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON MON., AUG. 17, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Coastal Area AQI: 50 PM2.5 Inland Orange County AQI: 50 PM2.5 Northern Mojave Desert AQI: 50 Ozone Temecula/Anza Area AQI: 47 Ozone MODERATE in the following area(s): Antelope Valley AQI: 58 Ozone Banning Pass Area AQI: 84 Ozone Big Bear Lake AQI: 67 Ozone Central Mojave Desert AQI: 58 Ozone Coachella Valley/Low Desert AQI: 84 Ozone Hemet/Elsinore Area AQI: 90 Ozone Metropolitan Area AQI: 53 PM2.5 San Fernando/Santa Clarita Valleys AQI: 61 Ozone San Gabriel Mountains AQI: 71 Ozone Victor Valley AQI: 51 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 112 Ozone San Bernardino Mountains AQI: 108 Ozone San Bernardino Valley AQI: 122 Ozone San Gabriel Valley AQI: 118 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Night and morning low clouds are expected on Monday for the coasts and valleys, but less than was seen in recent days. Weakening onshore flow and a gradual warming trend are forecast to continue. The National Weather Service (NWS) has issued an Extreme Heat Warning for portions of eastern Riverside County in effect on Monday from 10 AM to 8 PM. Inversion Base: 1631 FT | Breaking Temperature: 87 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2237 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 9, 10, 23, 32, 33, 34, 35, 37 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, AUGUST 17, 2026 IN THE SOUTH COAST AIR BASIN.