SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., JUL. 21, 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 57 50 0.4 31 12 27 56 2 NW Coastal LA 41 38 0.3 31 10 18 53 3 SW Coastal LA 35 32 0.6 32 9 8 50 4 S Coastal LA 44 39 0.2 35 8 21 44 5 Southeast LA Co 49 44 0.4 36 10 24 53 6 W San Fernando Vly 61 54 0.3 31 10 12 53 7 E San Fernando Vly 65 57 0.4 32 13 21 58 8 W San Gabriel Vly 71 60 0.3 35 14 17 67 9 E San Gabriel Vly 82 71 0.3 38 13 25 101 10 Pomona Walnut Vly 74 65 0.4 40 12 26 84 11 S San Gabriel Vly 63 55 0.3 37 12 24 56 12 S Central LA Co 44 39 0.3 33 10 15 53 13 Santa Clarita Vly 81 68 0.2 32 11 20 93 15 San Gabriel Mts 76 68 0.4 38 13 24 93 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 71 66 0.3 33 13 16 87 Orange County: South Coast Air Basin 16 N Orange Co 48 44 0.1 40 10 12 53 17 Central Orange Co 43 39 0.3 37 10 11 53 18 N Coastal Orange Co 41 38 0.2 35 8 18 44 19 Saddleback Vly 41 39 0.1 40 6 15 37 20 Central Coastal 40 39 0.2 34 7 15 39 21 Capistrano Vly 41 39 0.3 37 7 15 39 Riverside County: South Coast Air Basin 22 Norco/Corona 56 51 0.4 45 9 18 50 23 Metro Riverside Co 69 62 0.6 47 12 17 74 24 Perris Vly 62 57 0.4 43 10 23 58 25 Lake Elsinore 50 48 0.3 32 11 16 55 26 Temecula Vly 45 41 0.3 45 7 14 42 27 Anza Vly 49 46 0.2 51 6 11 47 28 Hemet/San Jacinto 58 52 0.3 40 7 23 48 29 Banning 70 62 0.3 38 7 18 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 64 61 0.2 61 9 8 71 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 54 51 0.2 41 8 9 47 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 72 65 0.4 39 13 24 84 33 SW San Bernardino Vly 65 59 0.4 45 12 28 64 34 C San Bernardino Vly 77 71 0.4 47 12 32 101 35 E San Bernardino Vly 76 70 0.5 45 11 27 100 36 W San Bernardino Mtns 79 73 0.3 39 13 29 108 37 C San Bernardino Mtns 84 79 0.3 45 9 30 129 38 Big Bear Lake 68 63 0.3 41 6 26 77 San Bernardino County: Mojave Desert Air Basin 39 Phelan 85 76 0.3 35 10 29 118 40 Hesperia 70 66 0.3 34 10 30 87 41 Trona 55 51 0.2 29 7 10 47 42 Victorville 73 67 0.3 35 10 31 90 43 Yucca Vly 63 58 0.2 36 8 15 61 44 Barstow 70 64 0.2 27 9 30 80 45 Twentynine Palms 59 54 0.2 37 8 14 50 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., JUL. 21, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Temecula/Anza Area AQI: 47 PM10 MODERATE in the following area(s): Antelope Valley AQI: 87 Ozone Banning Pass Area AQI: 74 Ozone Big Bear Lake AQI: 77 Ozone Central Mojave Desert AQI: 61 Ozone Coachella Valley/Low Desert AQI: 71 Ozone Coastal Area AQI: 53 PM2.5 Hemet/Elsinore Area AQI: 58 Ozone Inland Orange County AQI: 53 PM2.5 Metropolitan Area AQI: 56 PM2.5 Northern Mojave Desert AQI: 80 Ozone Riverside Valley AQI: 74 Ozone San Fernando/Santa Clarita Valleys AQI: 93 Ozone San Gabriel Mountains AQI: 93 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): San Bernardino Mountains AQI: 129 Ozone San Bernardino Valley AQI: 101 Ozone San Gabriel Valley AQI: 101 Ozone Victor Valley AQI: 118 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures are expected to be slightly warmer on Tuesday compared to Monday. Onshore flow is expected to continue. Inversion Base: 1578 FT | Breaking Temperature: 83 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2119 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 9, 34, 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 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 TUESDAY, JULY 21, 2026 IN THE SOUTH COAST AIR BASIN.