SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., SEP. 22, 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 58 49 1.0 27 9 22 50 2 NW Coastal LA 46 42 0.3 26 8 15 44 3 SW Coastal LA 42 37 0.2 27 7 14 39 4 S Coastal LA 50 45 0.4 28 9 22 50 5 Southeast LA Co 55 48 0.7 29 10 21 53 6 W San Fernando Vly 63 56 0.4 26 11 12 55 7 E San Fernando Vly 64 57 0.6 28 10 17 58 8 W San Gabriel Vly 62 56 0.3 28 10 12 54 9 E San Gabriel Vly 73 62 0.4 26 11 18 74 10 Pomona Walnut Vly 71 61 0.4 33 11 22 71 11 S San Gabriel Vly 61 52 0.4 29 11 21 55 12 S Central LA Co 54 45 0.5 28 10 19 53 13 Santa Clarita Vly 70 63 0.2 28 11 15 77 15 San Gabriel Mts 62 57 0.4 33 10 22 58 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 60 58 0.3 33 9 26 61 Orange County: South Coast Air Basin 16 N Orange Co 55 47 0.2 32 10 15 53 17 Central Orange Co 53 47 0.4 29 10 12 53 18 N Coastal Orange Co 44 40 0.3 27 7 19 39 19 Saddleback Vly 49 45 0.2 31 9 13 50 20 Central Coastal 45 42 0.2 25 7 12 39 21 Capistrano Vly 46 43 0.3 22 7 9 40 Riverside County: South Coast Air Basin 22 Norco/Corona 69 60 0.4 36 11 14 67 23 Metro Riverside Co 77 66 0.7 38 11 19 87 24 Perris Vly 72 64 0.5 36 11 19 80 25 Lake Elsinore 61 56 0.3 21 8 8 54 26 Temecula Vly 48 45 0.2 24 7 8 42 27 Anza Vly 58 54 0.2 26 7 8 50 28 Hemet/San Jacinto 69 61 0.4 33 10 19 71 29 Banning 73 62 0.4 30 9 16 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 29 7 8 71 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 52 51 0.2 25 7 9 47 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 67 57 0.4 36 12 21 58 33 SW San Bernardino Vly 70 60 0.4 37 12 21 67 34 C San Bernardino Vly 72 70 0.4 42 12 23 100 35 E San Bernardino Vly 78 68 0.6 39 12 21 93 36 W San Bernardino Mtns 62 58 0.4 35 8 26 61 37 C San Bernardino Mtns 68 56 0.4 40 9 29 54 38 Big Bear Lake 58 56 0.4 35 7 24 54 San Bernardino County: Mojave Desert Air Basin 39 Phelan 56 55 0.4 31 7 32 51 40 Hesperia 59 57 0.4 31 7 33 58 41 Trona 51 49 0.2 21 7 49 46 42 Victorville 64 60 0.3 32 8 34 67 43 Yucca Vly 56 54 0.3 27 7 18 50 44 Barstow 59 57 0.3 32 7 42 58 45 Twentynine Palms 50 49 0.2 27 7 17 45 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., SEP. 22, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Central Mojave Desert AQI: 50 Ozone Coastal Area AQI: 50 PM2.5 Temecula/Anza Area AQI: 50 Ozone MODERATE in the following area(s): Antelope Valley AQI: 61 Ozone Banning Pass Area AQI: 74 Ozone Big Bear Lake AQI: 54 Ozone Coachella Valley/Low Desert AQI: 71 Ozone Hemet/Elsinore Area AQI: 80 Ozone Inland Orange County AQI: 53 PM2.5 Metropolitan Area AQI: 53 PM2.5 Northern Mojave Desert AQI: 58 Ozone Riverside Valley AQI: 87 Ozone San Bernardino Mountains AQI: 61 Ozone San Bernardino Valley AQI: 100 Ozone San Fernando/Santa Clarita Valleys AQI: 77 Ozone San Gabriel Mountains AQI: 58 Ozone San Gabriel Valley AQI: 74 Ozone Victor Valley AQI: 67 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Temperatures are expected to rise by a couple of degrees on Tuesday. The heavy marine layer is expected to continue. Temperatures will rise later in the week. Inversion Base: 4525 FT | Breaking Temperature: 88 DEG F Inversion Breaking: NO | Maximum Mixing HEIGHT: 4587 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 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, SEPTEMBER 22, 2026 IN THE SOUTH COAST AIR BASIN.