SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: SUN., MAY. 31, 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 60 53 0.4 33 10 20 53 2 NW Coastal LA 49 44 0.3 30 9 12 50 3 SW Coastal LA 43 39 0.2 31 7 11 39 4 S Coastal LA 51 48 0.2 30 7 19 44 5 Southeast LA Co 61 53 0.4 32 9 16 50 6 W San Fernando Vly 63 60 0.3 28 8 11 67 7 E San Fernando Vly 63 59 0.4 32 10 15 64 8 W San Gabriel Vly 68 60 0.3 31 10 12 67 9 E San Gabriel Vly 83 72 0.3 26 8 13 105 10 Pomona Walnut Vly 78 70 0.4 33 11 19 100 11 S San Gabriel Vly 70 60 0.3 32 10 14 67 12 S Central LA Co 55 48 0.3 31 8 10 44 13 Santa Clarita Vly 76 71 0.3 27 8 11 101 15 San Gabriel Mts 73 66 0.3 30 8 14 87 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 72 66 0.3 21 10 14 87 Orange County: South Coast Air Basin 16 N Orange Co 62 56 0.2 34 10 6 54 17 Central Orange Co 53 50 0.3 25 10 10 53 18 N Coastal Orange Co 45 42 0.2 26 5 16 39 19 Saddleback Vly 53 50 0.2 34 5 12 46 20 Central Coastal 48 44 0.2 26 5 11 41 21 Capistrano Vly 48 45 0.2 28 6 9 42 Riverside County: South Coast Air Basin 22 Norco/Corona 69 66 0.3 43 11 14 87 23 Metro Riverside Co 75 71 0.3 47 13 15 101 24 Perris Vly 62 59 0.3 34 11 19 64 25 Lake Elsinore 62 56 0.2 27 9 8 54 26 Temecula Vly 51 47 0.2 33 9 8 50 27 Anza Vly 58 55 0.2 37 7 8 51 28 Hemet/San Jacinto 63 59 0.3 34 10 20 64 29 Banning 72 68 0.3 31 9 17 93 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 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 71 68 0.2 57 9 9 93 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 55 53 0.2 36 5 9 49 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 81 73 0.4 33 12 13 108 33 SW San Bernardino Vly 75 69 0.4 43 13 18 97 34 C San Bernardino Vly 86 77 0.4 31 11 24 122 35 E San Bernardino Vly 83 76 0.3 35 11 22 118 36 W San Bernardino Mtns 81 72 0.3 32 8 21 105 37 C San Bernardino Mtns 95 83 0.3 31 7 25 143 38 Big Bear Lake 80 72 0.3 36 7 23 105 San Bernardino County: Mojave Desert Air Basin 39 Phelan 73 69 0.3 29 6 23 97 40 Hesperia 74 66 0.3 30 8 27 87 41 Trona 61 55 0.2 19 5 10 51 42 Victorville 78 69 0.3 30 8 26 97 43 Yucca Vly 71 68 0.2 43 8 18 93 44 Barstow 68 64 0.2 32 8 39 80 45 Twentynine Palms 63 61 0.2 41 7 16 71 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON SUN., MAY. 31, 2026, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Coastal Area AQI: 50 PM2.5 MODERATE in the following area(s): Antelope Valley AQI: 87 Ozone Banning Pass Area AQI: 93 Ozone Central Mojave Desert AQI: 93 Ozone Coachella Valley/Low Desert AQI: 93 Ozone Hemet/Elsinore Area AQI: 64 Ozone Inland Orange County AQI: 53 PM2.5 Metropolitan Area AQI: 54 Ozone Northern Mojave Desert AQI: 80 Ozone San Gabriel Mountains AQI: 87 Ozone Temecula/Anza Area AQI: 51 Ozone Victor Valley AQI: 97 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Big Bear Lake AQI: 105 Ozone Riverside Valley AQI: 101 Ozone San Bernardino Mountains AQI: 143 Ozone San Bernardino Valley AQI: 122 Ozone San Fernando/Santa Clarita Valleys AQI: 101 Ozone San Gabriel Valley AQI: 105 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ Partly cloudy skies becoming sunny with increasing temperatures are expected. Inversion Base: 1548 FT | Breaking Temperature: 75 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 2453 FT ------------------------------------------------------------------------ ------------------------------------------------------------------------ AIR QUALITY FORECAST RULE IMPLICATIONS ------------------------------------------------------------------------ Area 40 - South Coast Air Basin: MARGINAL-BURN Burning is prohibited in the following source/receptor areas: 9, 13, 23, 32, 34, 35, 36, 37, 38 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 SUNDAY, MAY 31, 2026 IN THE SOUTH COAST AIR BASIN.