SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., SEP. 29, 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 65 55 0.7 45 10 40 53 2 NW Coastal LA 52 47 0.5 39 8 24 44 3 SW Coastal LA 48 42 0.4 41 8 27 44 4 S Coastal LA 59 49 0.6 38 8 34 45 5 Southeast LA Co 64 52 0.8 41 9 34 50 6 W San Fernando Vly 59 54 0.9 36 7 26 50 7 E San Fernando Vly 61 54 0.8 44 8 32 50 8 W San Gabriel Vly 71 60 0.6 44 8 26 67 9 E San Gabriel Vly 75 61 0.5 38 7 29 71 10 Pomona Walnut Vly 75 61 0.5 38 10 41 71 11 S San Gabriel Vly 71 57 0.5 42 10 30 58 12 S Central LA Co 60 47 0.8 41 9 23 50 13 Santa Clarita Vly 64 53 0.3 38 6 20 49 15 San Gabriel Mts 61 53 0.5 42 6 27 49 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 55 52 0.4 35 9 28 50 Orange County: South Coast Air Basin 16 N Orange Co 65 54 0.3 33 10 20 53 17 Central Orange Co 57 49 0.5 25 9 20 50 18 N Coastal Orange Co 59 51 0.6 29 5 30 47 19 Saddleback Vly 65 59 0.3 33 4 23 64 20 Central Coastal 60 55 0.4 27 5 21 51 21 Capistrano Vly 60 55 0.3 29 7 19 51 Riverside County: South Coast Air Basin 22 Norco/Corona 68 59 0.5 41 10 27 64 23 Metro Riverside Co 71 58 0.5 48 12 35 61 24 Perris Vly 68 56 0.6 42 8 31 54 25 Lake Elsinore 66 58 0.3 29 8 18 61 26 Temecula Vly 55 47 0.3 28 7 16 44 27 Anza Vly 57 54 0.2 26 5 14 50 28 Hemet/San Jacinto 60 51 0.6 35 7 28 47 29 Banning 55 50 0.5 31 6 27 46 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 52 49 0.2 29 4 11 45 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 50 44 0.2 22 4 12 41 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 72 59 0.5 36 10 28 64 33 SW San Bernardino Vly 69 58 0.5 42 11 36 61 34 C San Bernardino Vly 77 61 0.7 42 8 31 71 35 E San Bernardino Vly 73 59 0.7 45 7 32 64 36 W San Bernardino Mtns 62 53 0.6 35 6 31 49 37 C San Bernardino Mtns 58 50 0.7 39 4 33 46 38 Big Bear Lake 52 48 0.6 35 4 29 44 San Bernardino County: Mojave Desert Air Basin 39 Phelan 51 50 0.5 31 4 34 46 40 Hesperia 46 44 0.6 22 5 35 41 41 Trona 51 43 0.3 18 4 50 47 42 Victorville 45 43 0.5 26 6 36 40 43 Yucca Vly 45 43 0.3 22 4 20 40 44 Barstow 46 42 0.4 14 5 39 39 45 Twentynine Palms 43 41 0.3 22 4 18 38 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., SEP. 29, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 50 PM2.5 Banning Pass Area AQI: 46 Ozone Big Bear Lake AQI: 44 Ozone Central Mojave Desert AQI: 40 Ozone Coachella Valley/Low Desert AQI: 45 Ozone Northern Mojave Desert AQI: 47 NO2 San Bernardino Mountains AQI: 49 Ozone San Fernando/Santa Clarita Valleys AQI: 50 Ozone San Gabriel Mountains AQI: 49 Ozone Temecula/Anza Area AQI: 50 Ozone Victor Valley AQI: 46 Ozone MODERATE in the following area(s): Coastal Area AQI: 51 Ozone Hemet/Elsinore Area AQI: 61 Ozone Inland Orange County AQI: 64 Ozone Metropolitan Area AQI: 53 PM2.5 Riverside Valley AQI: 64 Ozone San Bernardino Valley AQI: 71 Ozone San Gabriel Valley AQI: 71 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Light offshore pressure gradients on Tuesday. Increasing ventilation rates and gusty winds Tuesday afternoon. Inversion Base: 1386 FT | Breaking Temperature: 73 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 4320 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 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, SEPTEMBER 29, 2026 IN THE SOUTH COAST AIR BASIN.