SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., SEP. 30, 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 66 56 0.8 39 14 26 60 2 NW Coastal LA 52 47 0.4 35 11 13 55 3 SW Coastal LA 45 39 0.3 37 11 14 55 4 S Coastal LA 49 44 0.3 35 10 26 53 5 Southeast LA Co 60 50 0.6 38 12 21 56 6 W San Fernando Vly 73 67 0.5 33 11 14 90 7 E San Fernando Vly 65 59 0.6 39 13 24 64 8 W San Gabriel Vly 77 64 0.4 40 13 15 80 9 E San Gabriel Vly 86 70 0.5 41 11 24 100 10 Pomona Walnut Vly 82 66 0.4 42 13 24 87 11 S San Gabriel Vly 73 59 0.3 39 12 17 64 12 S Central LA Co 48 44 0.3 37 12 16 56 13 Santa Clarita Vly 85 72 0.3 35 11 26 105 15 San Gabriel Mts 76 66 0.5 41 11 33 87 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 67 57 0.4 36 12 37 58 Orange County: South Coast Air Basin 16 N Orange Co 65 53 0.2 44 12 10 56 17 Central Orange Co 54 46 0.4 30 11 10 55 18 N Coastal Orange Co 48 42 0.3 32 8 22 44 19 Saddleback Vly 53 46 0.2 44 7 18 43 20 Central Coastal 50 44 0.3 35 7 18 41 21 Capistrano Vly 52 46 0.4 39 8 20 44 Riverside County: South Coast Air Basin 22 Norco/Corona 74 64 0.5 57 13 25 80 23 Metro Riverside Co 82 72 0.6 63 15 32 105 24 Perris Vly 76 67 0.5 47 11 34 90 25 Lake Elsinore 68 62 0.4 40 10 20 74 26 Temecula Vly 53 50 0.3 39 9 18 50 27 Anza Vly 61 57 0.3 37 6 17 58 28 Hemet/San Jacinto 68 61 0.4 38 9 37 71 29 Banning 77 66 0.4 35 6 41 87 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 61 60 0.2 38 4 15 67 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 45 44 0.2 27 4 13 41 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 89 72 0.6 36 14 29 105 33 SW San Bernardino Vly 78 65 0.5 56 15 32 84 34 C San Bernardino Vly 85 71 0.5 42 11 37 101 35 E San Bernardino Vly 88 76 0.5 46 9 37 118 36 W San Bernardino Mtns 82 69 0.5 36 10 34 97 37 C San Bernardino Mtns 86 73 0.4 39 6 37 108 38 Big Bear Lake 65 61 0.4 37 4 37 71 San Bernardino County: Mojave Desert Air Basin 39 Phelan 57 54 0.4 30 6 37 50 40 Hesperia 63 56 0.4 19 7 38 54 41 Trona 47 44 0.2 18 4 49 46 42 Victorville 65 58 0.4 25 9 38 61 43 Yucca Vly 61 56 0.3 27 4 25 54 44 Barstow 50 47 0.3 26 8 47 44 45 Twentynine Palms 51 49 0.3 26 4 22 45 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., SEP. 30, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Northern Mojave Desert AQI: 46 NO2 MODERATE in the following area(s): Antelope Valley AQI: 58 Ozone Banning Pass Area AQI: 87 Ozone Big Bear Lake AQI: 71 Ozone Central Mojave Desert AQI: 54 Ozone Coachella Valley/Low Desert AQI: 67 Ozone Coastal Area AQI: 55 PM2.5 Hemet/Elsinore Area AQI: 90 Ozone Inland Orange County AQI: 55 PM2.5 Metropolitan Area AQI: 60 PM2.5 San Gabriel Mountains AQI: 87 Ozone San Gabriel Valley AQI: 100 Ozone Temecula/Anza Area AQI: 58 Ozone Victor Valley AQI: 61 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 105 Ozone San Bernardino Mountains AQI: 108 Ozone San Bernardino Valley AQI: 118 Ozone San Fernando/Santa Clarita Valleys AQI: 105 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Increasing temperatures on Wednesday. Light onshore pressure gradients and low ventilation. Inversion Base: 1423 FT | Breaking Temperature: 78 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 3088 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 13, 23, 32, 34, 35, 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 WEDNESDAY, SEPTEMBER 30, 2026 IN THE SOUTH COAST AIR BASIN.