SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: TUE., MAR. 17, 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 69 62 0.4 24 16 47 74 2 NW Coastal LA 62 55 0.8 28 22 34 75 3 SW Coastal LA 59 52 0.6 25 17 43 66 4 S Coastal LA 65 55 1.0 32 12 53 56 5 Southeast LA Co 64 57 1.5 33 18 51 68 6 W San Fernando Vly 67 61 0.9 22 10 29 71 7 E San Fernando Vly 70 65 0.8 23 9 40 84 8 W San Gabriel Vly 72 66 0.6 24 8 37 87 9 E San Gabriel Vly 85 70 0.5 18 6 38 100 10 Pomona Walnut Vly 86 60 0.7 32 12 47 67 11 S San Gabriel Vly 66 60 0.8 31 16 51 67 12 S Central LA Co 66 57 1.5 28 15 48 62 13 Santa Clarita Vly 65 60 0.4 23 7 27 67 15 San Gabriel Mts 65 59 0.6 24 5 36 64 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 51 48 0.5 24 11 35 55 Orange County: South Coast Air Basin 16 N Orange Co 69 56 0.8 35 15 40 62 17 Central Orange Co 62 52 0.9 35 14 37 60 18 N Coastal Orange Co 61 57 0.9 31 9 47 58 19 Saddleback Vly 72 64 0.4 35 6 37 80 20 Central Coastal 67 62 0.5 29 10 36 74 21 Capistrano Vly 68 63 0.4 25 10 32 77 Riverside County: South Coast Air Basin 22 Norco/Corona 90 69 0.7 38 11 39 97 23 Metro Riverside Co 95 73 0.7 41 14 44 108 24 Perris Vly 68 55 0.7 34 12 40 56 25 Lake Elsinore 72 62 0.5 23 7 30 74 26 Temecula Vly 54 47 0.4 26 6 27 44 27 Anza Vly 57 53 0.3 29 4 23 49 28 Hemet/San Jacinto 58 54 0.6 29 7 37 50 29 Banning 62 55 0.6 26 3 37 51 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 62 60 0.2 36 12 19 67 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 42 40 0.2 26 5 20 37 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 92 67 0.6 26 10 38 90 33 SW San Bernardino Vly 88 62 0.7 38 14 44 74 34 C San Bernardino Vly 75 61 0.8 34 9 46 71 35 E San Bernardino Vly 72 62 0.7 36 6 42 74 36 W San Bernardino Mtns 73 60 0.7 27 5 40 67 37 C San Bernardino Mtns 63 61 0.7 33 5 39 71 38 Big Bear Lake 54 51 0.7 30 5 38 47 San Bernardino County: Mojave Desert Air Basin 39 Phelan 49 46 0.6 25 4 37 43 40 Hesperia 48 43 0.6 25 5 40 40 41 Trona 43 39 0.3 15 3 50 47 42 Victorville 51 45 0.6 26 8 37 44 43 Yucca Vly 46 44 0.3 28 6 29 41 44 Barstow 51 43 0.4 28 5 51 48 45 Twentynine Palms 43 41 0.3 28 6 27 38 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON TUE., MAR. 17, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Big Bear Lake AQI: 47 Ozone Central Mojave Desert AQI: 41 Ozone Northern Mojave Desert AQI: 48 NO2 Temecula/Anza Area AQI: 49 Ozone Victor Valley AQI: 44 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 55 PM2.5 Banning Pass Area AQI: 51 Ozone Coachella Valley/Low Desert AQI: 67 Ozone Coastal Area AQI: 75 PM2.5 Hemet/Elsinore Area AQI: 74 Ozone Inland Orange County AQI: 80 Ozone Metropolitan Area AQI: 74 Ozone San Bernardino Mountains AQI: 71 Ozone San Bernardino Valley AQI: 90 Ozone San Fernando/Santa Clarita Valleys AQI: 84 Ozone San Gabriel Mountains AQI: 64 Ozone San Gabriel Valley AQI: 100 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Riverside Valley AQI: 108 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Very strong high pressure is building over SoCal this week. On Tuesday, offshore winds will be slightly stronger than Monday, with east- northeast gusts up to 40 mph in the foothills. Temperature records will likely be broken on Tuesday, as SoCal warms 3-9 degrees over Monday. Inversion Base: 486 FT | Breaking Temperature: 85 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1756 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 23 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, MARCH 17, 2026 IN THE SOUTH COAST AIR BASIN.