SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: WED., MAR. 18, 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 68 64 0.5 30 18 46 80 2 NW Coastal LA 60 55 0.6 32 25 36 81 3 SW Coastal LA 55 49 0.4 29 14 28 60 4 S Coastal LA 60 56 0.4 29 9 32 54 5 Southeast LA Co 64 59 0.8 30 19 43 69 6 W San Fernando Vly 74 68 0.7 27 11 31 93 7 E San Fernando Vly 74 69 0.6 30 11 40 97 8 W San Gabriel Vly 78 71 0.5 31 12 36 101 9 E San Gabriel Vly 87 75 0.6 27 11 39 115 10 Pomona Walnut Vly 90 72 0.7 36 17 53 105 11 S San Gabriel Vly 72 63 0.7 30 21 36 77 12 S Central LA Co 60 58 0.8 30 15 43 62 13 Santa Clarita Vly 74 65 0.4 29 7 33 84 15 San Gabriel Mts 73 67 0.5 32 7 36 90 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 65 60 0.4 32 13 34 67 Orange County: South Coast Air Basin 16 N Orange Co 70 62 0.6 41 17 28 74 17 Central Orange Co 58 54 0.5 29 15 32 62 18 N Coastal Orange Co 56 50 0.4 28 6 32 46 19 Saddleback Vly 68 61 0.3 41 6 36 71 20 Central Coastal 57 53 0.4 28 8 31 49 21 Capistrano Vly 60 54 0.4 28 7 31 50 Riverside County: South Coast Air Basin 22 Norco/Corona 84 72 0.6 55 14 40 105 23 Metro Riverside Co 93 78 0.5 61 16 48 126 24 Perris Vly 84 72 0.5 42 14 42 105 25 Lake Elsinore 81 69 0.5 28 9 31 97 26 Temecula Vly 56 55 0.4 28 8 27 51 27 Anza Vly 67 62 0.3 31 7 22 74 28 Hemet/San Jacinto 69 62 0.5 30 9 39 74 29 Banning 69 63 0.5 26 6 41 77 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 67 60 0.3 36 17 15 67 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 44 40 0.3 26 6 17 37 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 109 90 0.5 26 13 33 161 33 SW San Bernardino Vly 90 72 0.6 53 16 46 105 34 C San Bernardino Vly 94 76 0.6 34 11 47 118 35 E San Bernardino Vly 87 73 0.5 45 8 44 108 36 W San Bernardino Mtns 99 82 0.5 30 8 38 140 37 C San Bernardino Mtns 85 68 0.5 33 7 38 93 38 Big Bear Lake 60 55 0.5 30 6 38 51 San Bernardino County: Mojave Desert Air Basin 39 Phelan 68 64 0.5 30 6 34 80 40 Hesperia 62 58 0.5 29 7 37 61 41 Trona 48 45 0.3 22 6 95 95 42 Victorville 61 57 0.5 32 9 34 58 43 Yucca Vly 54 49 0.3 29 6 25 45 44 Barstow 51 46 0.4 34 7 45 43 45 Twentynine Palms 43 42 0.3 29 6 23 39 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON WED., MAR. 18, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Central Mojave Desert AQI: 45 Ozone MODERATE in the following area(s): Antelope Valley AQI: 67 Ozone Banning Pass Area AQI: 77 Ozone Big Bear Lake AQI: 51 Ozone Coachella Valley/Low Desert AQI: 67 Ozone Coastal Area AQI: 81 PM2.5 Inland Orange County AQI: 71 Ozone Metropolitan Area AQI: 80 Ozone Northern Mojave Desert AQI: 95 NO2 San Fernando/Santa Clarita Valleys AQI: 97 Ozone San Gabriel Mountains AQI: 90 Ozone Temecula/Anza Area AQI: 74 Ozone Victor Valley AQI: 80 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Hemet/Elsinore Area AQI: 105 Ozone Riverside Valley AQI: 126 Ozone San Bernardino Mountains AQI: 140 Ozone San Gabriel Valley AQI: 115 Ozone UNHEALTHY in the following area(s): San Bernardino Valley AQI: 161 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Wednesday temperatures approach all-time records for SoCal as the high pressure system overhead gains strength. Light onshore winds are expected. Inversion Base: 486 FT | Breaking Temperature: 81 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2155 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 WEDNESDAY, MARCH 18, 2026 IN THE SOUTH COAST AIR BASIN.