SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., OCT. 21, 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 63 51 1.0 42 13 48 58 2 NW Coastal LA 53 46 0.7 38 15 32 62 3 SW Coastal LA 51 44 0.3 39 8 34 44 4 S Coastal LA 56 46 0.5 36 7 31 43 5 Southeast LA Co 59 47 0.9 39 10 43 53 6 W San Fernando Vly 73 63 0.9 35 15 35 77 7 E San Fernando Vly 69 59 0.8 41 14 43 64 8 W San Gabriel Vly 69 56 0.6 41 13 41 58 9 E San Gabriel Vly 78 62 0.8 42 11 38 74 10 Pomona Walnut Vly 72 59 0.9 43 14 50 64 11 S San Gabriel Vly 61 49 0.7 41 12 38 56 12 S Central LA Co 59 48 0.8 39 9 35 50 13 Santa Clarita Vly 78 65 0.5 35 9 31 84 15 San Gabriel Mts 70 60 0.7 42 11 40 67 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 61 56 0.6 31 9 37 54 Orange County: South Coast Air Basin 16 N Orange Co 60 50 0.5 47 12 26 56 17 Central Orange Co 54 45 0.7 24 10 30 53 18 N Coastal Orange Co 54 44 0.5 29 5 30 41 19 Saddleback Vly 61 54 0.4 47 11 36 55 20 Central Coastal 53 46 0.5 32 6 29 43 21 Capistrano Vly 54 48 0.5 36 6 30 44 Riverside County: South Coast Air Basin 22 Norco/Corona 77 63 0.8 70 16 40 77 23 Metro Riverside Co 85 67 0.9 79 16 41 90 24 Perris Vly 70 61 0.8 54 13 43 71 25 Lake Elsinore 69 64 0.5 37 7 30 80 26 Temecula Vly 62 56 0.4 36 5 28 54 27 Anza Vly 59 54 0.4 38 5 28 50 28 Hemet/San Jacinto 66 59 0.7 35 7 45 64 29 Banning 62 56 0.7 28 7 48 54 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 54 50 0.3 50 7 29 46 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 45 42 0.3 34 5 20 39 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 70 56 0.8 29 12 37 56 33 SW San Bernardino Vly 72 58 0.8 67 16 47 64 34 C San Bernardino Vly 74 60 0.9 32 11 54 67 35 E San Bernardino Vly 76 62 0.8 54 10 45 74 36 W San Bernardino Mtns 70 58 0.8 33 9 44 61 37 C San Bernardino Mtns 69 60 0.8 31 10 44 67 38 Big Bear Lake 57 53 0.8 30 7 45 49 San Bernardino County: Mojave Desert Air Basin 39 Phelan 64 60 0.7 32 6 39 67 40 Hesperia 55 51 0.7 27 10 43 53 41 Trona 51 40 0.4 19 5 9 37 42 Victorville 56 53 0.7 29 11 39 55 43 Yucca Vly 62 59 0.4 35 5 34 64 44 Barstow 51 47 0.5 28 5 50 47 45 Twentynine Palms 46 44 0.4 35 5 30 41 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., OCT. 21, 2025, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Big Bear Lake AQI: 49 Ozone Coachella Valley/Low Desert AQI: 46 Ozone Northern Mojave Desert AQI: 47 NO2 MODERATE in the following area(s): Antelope Valley AQI: 54 Ozone Banning Pass Area AQI: 54 Ozone Central Mojave Desert AQI: 64 Ozone Coastal Area AQI: 62 PM2.5 Hemet/Elsinore Area AQI: 80 Ozone Inland Orange County AQI: 55 PM2.5 Metropolitan Area AQI: 58 PM2.5 Riverside Valley AQI: 90 Ozone San Bernardino Mountains AQI: 67 Ozone San Bernardino Valley AQI: 74 Ozone San Fernando/Santa Clarita Valleys AQI: 84 Ozone San Gabriel Mountains AQI: 67 Ozone San Gabriel Valley AQI: 74 Ozone Temecula/Anza Area AQI: 54 Ozone Victor Valley AQI: 67 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Higher temperatures continue on Tuesday, with weak offshore pressure gradients predicted. Inversion Base: 486 FT | Breaking Temperature: 73 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1580 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, OCTOBER 21, 2025 IN THE SOUTH COAST AIR BASIN.