SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., SEP. 19, 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 49 39 0.9 22 7 24 39 2 NW Coastal LA 41 34 0.4 21 6 16 33 3 SW Coastal LA 40 33 0.2 20 7 13 39 4 S Coastal LA 44 38 0.3 19 8 26 44 5 Southeast LA Co 47 39 0.6 20 8 23 44 6 W San Fernando Vly 48 40 0.3 21 5 18 37 7 E San Fernando Vly 51 43 0.6 23 7 20 40 8 W San Gabriel Vly 49 41 0.3 24 8 13 44 9 E San Gabriel Vly 64 53 0.4 23 7 18 49 10 Pomona Walnut Vly 70 55 0.4 45 8 20 51 11 S San Gabriel Vly 51 41 0.3 22 7 20 39 12 S Central LA Co 44 37 0.3 20 8 21 44 13 Santa Clarita Vly 52 46 0.2 24 6 15 43 15 San Gabriel Mts 52 45 0.3 43 7 29 42 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 51 48 0.2 29 8 36 44 Orange County: South Coast Air Basin 16 N Orange Co 54 43 0.2 26 8 15 44 17 Central Orange Co 49 39 0.3 22 10 16 53 18 N Coastal Orange Co 45 39 0.3 16 6 23 36 19 Saddleback Vly 49 43 0.2 26 5 16 40 20 Central Coastal 46 41 0.2 16 5 15 38 21 Capistrano Vly 43 40 0.2 17 5 12 37 Riverside County: South Coast Air Basin 22 Norco/Corona 59 50 0.4 38 8 16 46 23 Metro Riverside Co 64 55 0.8 38 10 14 53 24 Perris Vly 56 49 0.4 30 7 17 45 25 Lake Elsinore 45 40 0.2 17 6 10 37 26 Temecula Vly 37 34 0.2 20 6 9 33 27 Anza Vly 46 42 0.2 22 5 9 39 28 Hemet/San Jacinto 46 43 0.3 27 5 17 40 29 Banning 54 48 0.3 24 4 15 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 56 52 0.2 51 7 8 48 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 45 43 0.2 28 4 9 40 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 61 50 0.3 58 8 18 52 33 SW San Bernardino Vly 62 51 0.3 50 8 21 47 34 C San Bernardino Vly 65 56 0.3 32 8 24 54 35 E San Bernardino Vly 62 54 0.6 31 7 19 50 36 W San Bernardino Mtns 58 50 0.3 43 6 22 46 37 C San Bernardino Mtns 80 66 0.3 32 5 23 87 38 Big Bear Lake 50 47 0.3 30 4 19 44 San Bernardino County: Mojave Desert Air Basin 39 Phelan 40 38 0.3 26 4 25 35 40 Hesperia 61 52 0.3 15 6 25 48 41 Trona 51 49 0.2 14 4 11 45 42 Victorville 63 55 0.3 24 6 25 51 43 Yucca Vly 54 49 0.2 36 4 14 45 44 Barstow 61 57 0.2 30 4 29 58 45 Twentynine Palms 51 47 0.2 35 4 13 44 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., SEP. 19, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 44 PM2.5 Banning Pass Area AQI: 44 Ozone Big Bear Lake AQI: 44 Ozone Central Mojave Desert AQI: 45 Ozone Coachella Valley/Low Desert AQI: 48 Ozone Coastal Area AQI: 44 PM2.5 Hemet/Elsinore Area AQI: 45 Ozone Metropolitan Area AQI: 44 PM2.5 San Fernando/Santa Clarita Valleys AQI: 43 Ozone San Gabriel Mountains AQI: 42 Ozone Temecula/Anza Area AQI: 39 Ozone MODERATE in the following area(s): Inland Orange County AQI: 53 PM2.5 Northern Mojave Desert AQI: 58 Ozone Riverside Valley AQI: 53 PM2.5 San Bernardino Mountains AQI: 87 Ozone San Bernardino Valley AQI: 54 Ozone San Gabriel Valley AQI: 51 Ozone Victor Valley AQI: 51 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Friday will bring fewer showers and thunderstorms, with activity mainly limited to the mountains and deserts in the afternoon. Temperatures will be a bit cooler near the coast and valleys, Inversion Base: 486 FT | Breaking Temperature: 59 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1872 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 FRIDAY, SEPTEMBER 19, 2025 IN THE SOUTH COAST AIR BASIN.