SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: MON., JUL. 20, 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 56 49 0.6 27 13 19 58 2 NW Coastal LA 42 37 0.3 28 11 10 55 3 SW Coastal LA 38 33 0.2 33 9 8 50 4 S Coastal LA 47 38 0.2 42 9 15 50 5 Southeast LA Co 52 43 0.4 42 11 20 55 6 W San Fernando Vly 61 52 0.4 28 9 12 50 7 E San Fernando Vly 62 55 0.4 28 12 16 56 8 W San Gabriel Vly 66 58 0.3 32 13 13 61 9 E San Gabriel Vly 79 67 0.4 33 12 23 90 10 Pomona Walnut Vly 75 63 0.4 43 12 24 77 11 S San Gabriel Vly 58 49 0.4 42 12 20 56 12 S Central LA Co 49 39 0.2 35 10 13 53 13 Santa Clarita Vly 71 59 0.3 29 10 17 64 15 San Gabriel Mts 69 61 0.4 36 12 24 71 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 63 59 0.3 33 13 14 64 Orange County: South Coast Air Basin 16 N Orange Co 57 48 0.2 46 11 10 55 17 Central Orange Co 48 41 0.3 46 11 10 55 18 N Coastal Orange Co 43 38 0.2 42 9 14 50 19 Saddleback Vly 48 43 0.2 43 8 15 44 20 Central Coastal 48 42 0.3 40 9 15 50 21 Capistrano Vly 48 42 0.3 37 9 16 50 Riverside County: South Coast Air Basin 22 Norco/Corona 61 55 0.3 43 11 16 55 23 Metro Riverside Co 69 62 0.4 44 12 17 74 24 Perris Vly 65 61 0.4 43 11 21 71 25 Lake Elsinore 60 53 0.3 35 12 17 56 26 Temecula Vly 45 42 0.3 40 11 15 55 27 Anza Vly 51 48 0.2 44 7 12 44 28 Hemet/San Jacinto 60 56 0.3 40 9 22 54 29 Banning 67 65 0.3 37 7 20 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 72 62 0.2 50 10 9 74 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 47 45 0.2 36 8 10 44 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 81 69 0.5 39 14 26 97 33 SW San Bernardino Vly 71 61 0.4 44 12 26 71 34 C San Bernardino Vly 79 69 0.4 47 11 29 97 35 E San Bernardino Vly 77 70 0.4 44 10 23 100 36 W San Bernardino Mtns 81 75 0.4 37 12 28 115 37 C San Bernardino Mtns 79 73 0.4 43 6 29 108 38 Big Bear Lake 61 58 0.3 40 6 24 61 San Bernardino County: Mojave Desert Air Basin 39 Phelan 85 87 0.3 31 10 29 154 40 Hesperia 68 62 0.3 26 9 31 74 41 Trona 55 51 0.2 27 8 16 47 42 Victorville 72 66 0.3 28 10 32 87 43 Yucca Vly 61 55 0.2 32 8 17 51 44 Barstow 64 60 0.3 28 9 36 67 45 Twentynine Palms 58 54 0.2 33 9 16 50 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON MON., JUL. 20, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... MODERATE in the following area(s): Antelope Valley AQI: 64 Ozone Banning Pass Area AQI: 84 Ozone Big Bear Lake AQI: 61 Ozone Central Mojave Desert AQI: 51 Ozone Coachella Valley/Low Desert AQI: 74 Ozone Coastal Area AQI: 55 PM2.5 Hemet/Elsinore Area AQI: 71 Ozone Inland Orange County AQI: 55 PM2.5 Metropolitan Area AQI: 58 PM2.5 Northern Mojave Desert AQI: 67 Ozone Riverside Valley AQI: 74 Ozone San Bernardino Valley AQI: 100 Ozone San Fernando/Santa Clarita Valleys AQI: 64 Ozone San Gabriel Mountains AQI: 71 Ozone San Gabriel Valley AQI: 90 Ozone Temecula/Anza Area AQI: 55 PM2.5 UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): San Bernardino Mountains AQI: 115 Ozone UNHEALTHY in the following area(s): Victor Valley AQI: 154 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Mostly sunny skies with cooler temperarues are expected. Inversion Base: 1558 FT | Breaking Temperature: 85 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2049 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 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 MONDAY, JULY 20, 2026 IN THE SOUTH COAST AIR BASIN.