SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SAT., MAR. 21, 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 80 66 0.5 28 16 37 87 2 NW Coastal LA 77 58 0.7 27 17 19 66 3 SW Coastal LA 70 53 0.3 30 14 19 60 4 S Coastal LA 73 61 0.5 38 11 27 71 5 Southeast LA Co 73 61 0.6 39 14 31 71 6 W San Fernando Vly 64 57 0.6 27 12 26 58 7 E San Fernando Vly 77 64 0.6 29 13 30 80 8 W San Gabriel Vly 93 80 0.4 32 13 25 133 9 E San Gabriel Vly 95 81 0.5 36 12 31 136 10 Pomona Walnut Vly 95 81 0.6 43 18 40 136 11 S San Gabriel Vly 74 63 0.6 40 17 26 77 12 S Central LA Co 74 60 0.6 33 13 25 67 13 Santa Clarita Vly 71 60 0.4 29 11 20 67 15 San Gabriel Mts 74 65 0.5 36 11 28 84 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 57 53 0.4 31 15 9 62 Orange County: South Coast Air Basin 16 N Orange Co 72 61 0.3 45 15 19 71 17 Central Orange Co 74 62 0.4 42 13 20 74 18 N Coastal Orange Co 72 61 0.5 38 10 24 71 19 Saddleback Vly 66 60 0.3 45 10 25 67 20 Central Coastal 67 60 0.3 36 10 21 67 21 Capistrano Vly 62 58 0.4 33 9 22 61 Riverside County: South Coast Air Basin 22 Norco/Corona 82 74 0.7 53 15 29 112 23 Metro Riverside Co 96 85 1.0 58 16 37 150 24 Perris Vly 59 56 0.7 42 12 34 56 25 Lake Elsinore 58 54 0.4 32 12 22 56 26 Temecula Vly 52 49 0.3 34 8 20 45 27 Anza Vly 68 60 0.3 37 9 17 67 28 Hemet/San Jacinto 61 57 0.5 34 9 30 58 29 Banning 64 59 0.5 30 7 25 64 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 73 61 0.2 42 8 14 71 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 59 52 0.2 30 7 12 48 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 96 87 0.6 26 13 30 154 33 SW San Bernardino Vly 91 81 0.6 52 18 36 136 34 C San Bernardino Vly 101 86 0.7 37 13 37 151 35 E San Bernardino Vly 103 88 0.8 43 9 35 156 36 W San Bernardino Mtns 86 77 0.6 29 10 31 122 37 C San Bernardino Mtns 69 64 0.6 35 9 32 80 38 Big Bear Lake 69 61 0.6 33 8 30 71 San Bernardino County: Mojave Desert Air Basin 39 Phelan 65 61 0.5 29 9 22 71 40 Hesperia 60 55 0.6 24 9 28 51 41 Trona 62 51 0.3 37 7 17 47 42 Victorville 61 56 0.5 28 11 20 55 43 Yucca Vly 66 59 0.3 28 11 20 64 44 Barstow 56 52 0.4 31 11 34 55 45 Twentynine Palms 64 57 0.3 29 13 18 58 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SAT., MAR. 21, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... MODERATE in the following area(s): Antelope Valley AQI: 62 PM2.5 Banning Pass Area AQI: 64 Ozone Big Bear Lake AQI: 71 Ozone Central Mojave Desert AQI: 64 Ozone Coachella Valley/Low Desert AQI: 71 Ozone Coastal Area AQI: 71 Ozone Hemet/Elsinore Area AQI: 58 Ozone Inland Orange County AQI: 74 Ozone Metropolitan Area AQI: 87 Ozone Northern Mojave Desert AQI: 55 PM2.5 San Fernando/Santa Clarita Valleys AQI: 80 Ozone San Gabriel Mountains AQI: 84 Ozone Temecula/Anza Area AQI: 67 Ozone Victor Valley AQI: 71 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 150 Ozone San Bernardino Mountains AQI: 122 Ozone San Gabriel Valley AQI: 136 Ozone UNHEALTHY in the following area(s): San Bernardino Valley AQI: 156 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ The overhead ridge weakens slightly allowing for a little onshore flow and cooling. Saturday temperatures will be 4-8 degrees cooler than Friday and afternoon winds will gust to 30 mph in the Inland Empire and Deserts. Inversion Base: 486 FT | Breaking Temperature: 79 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1391 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 SATURDAY, MARCH 21, 2026 IN THE SOUTH COAST AIR BASIN.