SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., SEP. 16, 2025 -------------------------------------------------------------------------------- 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 68 56 0.7 34 15 39 62 2 NW Coastal LA 53 46 0.5 32 14 25 60 3 SW Coastal LA 46 40 0.1 32 13 19 58 4 S Coastal LA 56 46 0.3 30 14 31 60 5 Southeast LA Co 65 54 0.6 31 15 35 62 6 W San Fernando Vly 66 57 0.5 30 10 22 58 7 E San Fernando Vly 64 53 0.6 34 10 31 53 8 W San Gabriel Vly 83 65 0.4 34 10 26 84 9 E San Gabriel Vly 92 73 0.5 27 13 33 108 10 Pomona Walnut Vly 87 74 0.6 39 15 40 112 11 S San Gabriel Vly 72 57 0.5 32 15 33 62 12 S Central LA Co 63 52 0.4 32 14 28 60 13 Santa Clarita Vly 68 61 0.3 32 10 25 71 15 San Gabriel Mts 69 59 0.4 38 9 32 64 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 63 56 0.3 34 12 31 56 Orange County: South Coast Air Basin 16 N Orange Co 68 58 0.2 33 14 21 61 17 Central Orange Co 58 50 0.3 19 12 20 56 18 N Coastal Orange Co 55 44 0.3 24 15 28 62 19 Saddleback Vly 64 55 0.3 33 18 26 68 20 Central Coastal 57 49 0.3 24 18 23 68 21 Capistrano Vly 59 51 0.4 29 16 23 64 Riverside County: South Coast Air Basin 22 Norco/Corona 88 71 0.5 45 17 31 101 23 Metro Riverside Co 96 79 0.5 50 16 36 129 24 Perris Vly 87 65 0.4 40 12 34 84 25 Lake Elsinore 70 56 0.4 24 8 23 54 26 Temecula Vly 53 48 0.3 38 8 20 44 27 Anza Vly 58 53 0.2 44 7 17 49 28 Hemet/San Jacinto 71 57 0.4 36 8 31 58 29 Banning 77 63 0.3 36 8 27 77 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 74 65 0.2 55 12 13 84 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 52 50 0.2 33 6 13 46 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 84 70 0.5 45 15 37 100 33 SW San Bernardino Vly 87 73 0.6 48 16 38 108 34 C San Bernardino Vly 96 77 0.5 38 12 38 122 35 E San Bernardino Vly 90 71 0.4 44 10 35 101 36 W San Bernardino Mtns 80 66 0.4 41 9 36 87 37 C San Bernardino Mtns 95 78 0.4 38 6 35 126 38 Big Bear Lake 65 58 0.4 37 7 33 61 San Bernardino County: Mojave Desert Air Basin 39 Phelan 57 52 0.4 35 6 32 48 40 Hesperia 66 62 0.4 33 9 34 74 41 Trona 59 57 0.2 29 7 11 58 42 Victorville 63 61 0.4 37 11 31 71 43 Yucca Vly 67 61 0.2 35 10 23 71 44 Barstow 60 57 0.3 43 11 45 58 45 Twentynine Palms 57 54 0.2 33 8 20 50 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., SEP. 16, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Temecula/Anza Area AQI: 49 Ozone MODERATE in the following area(s): Antelope Valley AQI: 56 PM2.5 Banning Pass Area AQI: 77 Ozone Big Bear Lake AQI: 61 Ozone Central Mojave Desert AQI: 71 Ozone Coachella Valley/Low Desert AQI: 84 Ozone Coastal Area AQI: 68 PM2.5 Hemet/Elsinore Area AQI: 84 Ozone Inland Orange County AQI: 68 PM2.5 Metropolitan Area AQI: 62 PM2.5 Northern Mojave Desert AQI: 58 Ozone San Fernando/Santa Clarita Valleys AQI: 71 Ozone San Gabriel Mountains AQI: 64 Ozone Victor Valley AQI: 74 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 129 Ozone San Bernardino Mountains AQI: 126 Ozone San Bernardino Valley AQI: 122 Ozone San Gabriel Valley AQI: 112 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Tuesday will be warmer than normal, with mild temperatures near the coast and hot conditions inland. Afternoon clouds and a chance of thunderstorms may develop over the mountains and deserts. Inversion Base: 486 FT | Breaking Temperature: 82 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1502 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: NO-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 16, 2025 IN THE SOUTH COAST AIR BASIN.