SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: FRI., MAR. 20, 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 81 68 0.4 33 14 40 93 2 NW Coastal LA 75 57 0.4 32 21 32 73 3 SW Coastal LA 69 52 0.2 34 14 21 60 4 S Coastal LA 72 59 0.3 41 10 24 64 5 Southeast LA Co 76 66 0.5 42 12 35 87 6 W San Fernando Vly 71 67 0.6 31 10 23 90 7 E San Fernando Vly 78 70 0.5 33 11 35 100 8 W San Gabriel Vly 88 78 0.5 34 11 32 126 9 E San Gabriel Vly 96 89 0.5 29 12 39 159 10 Pomona Walnut Vly 103 88 0.6 41 19 46 156 11 S San Gabriel Vly 89 75 0.4 40 16 30 115 12 S Central LA Co 73 61 0.5 37 11 28 71 13 Santa Clarita Vly 84 73 0.4 32 7 28 108 15 San Gabriel Mts 81 74 0.5 33 8 34 112 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 67 63 0.4 33 14 29 77 Orange County: South Coast Air Basin 16 N Orange Co 80 69 0.2 44 15 21 97 17 Central Orange Co 65 57 0.4 44 12 19 58 18 N Coastal Orange Co 64 53 0.3 40 5 23 49 19 Saddleback Vly 76 69 0.3 44 7 28 97 20 Central Coastal 68 59 0.3 36 7 23 64 21 Capistrano Vly 69 62 0.4 31 8 26 74 Riverside County: South Coast Air Basin 22 Norco/Corona 93 84 0.4 49 13 34 147 23 Metro Riverside Co 102 91 0.4 53 16 41 164 24 Perris Vly 91 82 0.5 39 11 36 140 25 Lake Elsinore 80 72 0.4 28 9 27 105 26 Temecula Vly 72 62 0.3 34 8 24 74 27 Anza Vly 67 63 0.3 36 6 23 77 28 Hemet/San Jacinto 79 73 0.4 33 8 33 108 29 Banning 76 73 0.4 30 5 28 108 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 75 69 0.2 42 18 23 97 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 47 45 0.2 31 7 16 42 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 102 94 0.6 26 13 35 172 33 SW San Bernardino Vly 100 87 0.6 49 19 41 154 34 C San Bernardino Vly 95 88 0.5 36 10 41 156 35 E San Bernardino Vly 92 88 0.5 42 6 38 156 36 W San Bernardino Mtns 89 84 0.5 29 8 37 147 37 C San Bernardino Mtns 82 74 0.5 35 7 36 112 38 Big Bear Lake 76 69 0.5 33 7 33 97 San Bernardino County: Mojave Desert Air Basin 39 Phelan 75 70 0.5 30 5 34 100 40 Hesperia 76 68 0.5 28 8 36 93 41 Trona 53 49 0.3 27 5 7 45 42 Victorville 75 70 0.4 35 11 34 100 43 Yucca Vly 69 64 0.3 33 8 28 80 44 Barstow 69 63 0.4 44 8 46 77 45 Twentynine Palms 62 57 0.3 32 8 25 58 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON FRI., MAR. 20, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... MODERATE in the following area(s): Antelope Valley AQI: 77 Ozone Big Bear Lake AQI: 97 Ozone Central Mojave Desert AQI: 80 Ozone Coachella Valley/Low Desert AQI: 97 Ozone Coastal Area AQI: 73 PM2.5 Inland Orange County AQI: 97 Ozone Metropolitan Area AQI: 97 Ozone Northern Mojave Desert AQI: 77 Ozone Temecula/Anza Area AQI: 77 Ozone Victor Valley AQI: 100 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Banning Pass Area AQI: 108 Ozone Hemet/Elsinore Area AQI: 140 Ozone San Bernardino Mountains AQI: 147 Ozone San Fernando/Santa Clarita Valleys AQI: 108 Ozone San Gabriel Mountains AQI: 112 Ozone UNHEALTHY in the following area(s): Riverside Valley AQI: 164 Ozone San Bernardino Valley AQI: 172 Ozone San Gabriel Valley AQI: 159 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ The entrenched strong ridge overhead will guarantee another extremely hot day on Friday. The last day of winter will be about 30 degrees above normal, and generally within a degree of Thursday. Expect light to moderate winds. Inversion Base: 486 FT | Breaking Temperature: 84 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1505 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, MARCH 20, 2026 IN THE SOUTH COAST AIR BASIN.