SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., AUG. 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 61 54 0.6 28 12 37 56 2 NW Coastal LA 47 44 0.4 28 8 19 44 3 SW Coastal LA 40 37 0.2 30 10 21 53 4 S Coastal LA 45 41 0.3 36 11 27 55 5 Southeast LA Co 57 50 0.5 36 10 32 53 6 W San Fernando Vly 72 65 0.5 29 9 22 84 7 E San Fernando Vly 59 57 0.5 30 11 30 58 8 W San Gabriel Vly 79 66 0.4 33 11 25 87 9 E San Gabriel Vly 95 78 0.4 35 10 32 126 10 Pomona Walnut Vly 90 74 0.5 43 11 40 112 11 S San Gabriel Vly 67 57 0.5 38 11 31 58 12 S Central LA Co 49 45 0.4 32 11 22 55 13 Santa Clarita Vly 86 77 0.3 32 9 25 122 15 San Gabriel Mts 79 70 0.4 37 8 32 100 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 74 66 0.3 39 10 27 87 Orange County: South Coast Air Basin 16 N Orange Co 71 61 0.3 46 10 20 71 17 Central Orange Co 51 45 0.3 38 10 14 53 18 N Coastal Orange Co 50 44 0.3 36 7 24 41 19 Saddleback Vly 69 61 0.2 46 5 23 71 20 Central Coastal 58 52 0.3 35 5 22 48 21 Capistrano Vly 55 50 0.3 33 6 24 46 Riverside County: South Coast Air Basin 22 Norco/Corona 85 72 0.4 53 11 29 105 23 Metro Riverside Co 90 76 0.5 55 12 37 118 24 Perris Vly 79 72 0.5 43 11 35 105 25 Lake Elsinore 69 64 0.4 33 8 25 80 26 Temecula Vly 57 50 0.3 33 8 23 46 27 Anza Vly 59 53 0.3 36 6 21 49 28 Hemet/San Jacinto 70 64 0.4 33 8 32 80 29 Banning 79 71 0.4 28 6 28 101 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 65 0.2 44 9 19 84 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 45 43 0.2 33 7 18 40 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 91 78 0.5 39 11 35 126 33 SW San Bernardino Vly 86 73 0.5 56 12 40 108 34 C San Bernardino Vly 96 81 0.6 30 10 46 136 35 E San Bernardino Vly 94 82 0.5 42 10 36 140 36 W San Bernardino Mtns 85 75 0.4 37 7 40 115 37 C San Bernardino Mtns 92 82 0.4 31 5 40 140 38 Big Bear Lake 67 61 0.4 30 5 34 71 San Bernardino County: Mojave Desert Air Basin 39 Phelan 67 61 0.4 33 5 40 71 40 Hesperia 71 62 0.4 26 6 42 74 41 Trona 58 52 0.2 22 5 15 48 42 Victorville 76 63 0.4 30 7 42 77 43 Yucca Vly 65 57 0.3 34 6 26 58 44 Barstow 66 57 0.3 28 7 42 58 45 Twentynine Palms 49 47 0.2 34 7 24 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., AUG. 18, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Temecula/Anza Area AQI: 49 Ozone MODERATE in the following area(s): Antelope Valley AQI: 87 Ozone Big Bear Lake AQI: 71 Ozone Central Mojave Desert AQI: 58 Ozone Coachella Valley/Low Desert AQI: 84 Ozone Coastal Area AQI: 55 PM2.5 Inland Orange County AQI: 71 Ozone Metropolitan Area AQI: 71 Ozone Northern Mojave Desert AQI: 58 Ozone San Gabriel Mountains AQI: 100 Ozone Victor Valley AQI: 77 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Banning Pass Area AQI: 101 Ozone Hemet/Elsinore Area AQI: 105 Ozone Riverside Valley AQI: 118 Ozone San Bernardino Mountains AQI: 140 Ozone San Bernardino Valley AQI: 140 Ozone San Fernando/Santa Clarita Valleys AQI: 122 Ozone San Gabriel Valley AQI: 126 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Upper level high pressure will slowly build in from the east this week, bringing gradual warming and dry weather. Inversion Base: 1575 FT | Breaking Temperature: 91 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2017 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, 13, 22, 23, 24, 29, 32, 33, 34, 35, 36, 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 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 TUESDAY, AUGUST 18, 2026 IN THE SOUTH COAST AIR BASIN.