SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT DAILY AIR QUALITY FORECAST VALID: MON., SEP. 20, 2021 -------------------------------------------------------------------------------- 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 66 57 0.7 46 18 32 63 2 NW Coastal LA 55 48 0.5 41 15 24 57 3 SW Coastal LA 47 42 0.3 43 13 18 53 4 S Coastal LA 56 49 0.3 41 13 24 53 5 Southeast LA Co 70 57 0.6 44 13 27 58 6 W San Fernando Vly 82 75 0.6 37 14 25 115 7 E San Fernando Vly 72 64 0.6 45 18 27 80 8 W San Gabriel Vly 82 69 0.4 44 18 22 97 9 E San Gabriel Vly 96 77 0.5 34 18 28 122 10 Pomona Walnut Vly 94 72 0.7 47 16 38 105 11 S San Gabriel Vly 76 62 0.6 44 16 27 74 12 S Central LA Co 62 53 0.5 43 13 14 53 13 Santa Clarita Vly 77 72 0.4 38 20 25 105 15 San Gabriel Mts 79 70 0.5 43 16 31 100 Los Angeles County: Mojave Desert Air Basin 14 Antelope Vly 55 51 0.4 36 8 35 47 Orange County: South Coast Air Basin 16 N Orange Co 79 63 0.4 53 13 19 77 17 Central Orange Co 70 57 0.7 38 12 18 58 18 N Coastal Orange Co 58 52 0.4 37 9 23 48 19 Saddleback Vly 76 65 0.3 53 11 25 84 20 Central Coastal 63 56 0.4 35 9 20 54 21 Capistrano Vly 60 56 0.4 35 9 21 54 Riverside County: South Coast Air Basin 22 Norco/Corona 104 83 0.5 69 16 30 143 23 Metro Riverside Co 105 82 0.6 79 18 34 140 24 Perris Vly 88 78 0.6 47 16 32 126 25 Lake Elsinore 82 76 0.4 36 7 22 118 26 Temecula Vly 76 64 0.4 34 10 20 80 27 Anza Vly 57 54 0.3 32 6 18 50 28 Hemet/San Jacinto 74 68 0.5 34 13 30 93 29 Banning 69 68 0.5 31 13 27 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 66 61 0.2 44 14 17 71 Riverside County: Mojave Desert Air Basin 31 E Riverside Co 46 44 0.2 28 6 16 41 San Bernardino County: South Coast Air Basin 32 NW San Bernardino Vly 102 81 0.6 39 15 28 136 33 SW San Bernardino Vly 101 77 0.6 69 16 35 122 34 C San Bernardino Vly 98 84 0.6 37 15 37 147 35 E San Bernardino Vly 107 91 0.6 44 16 33 164 36 W San Bernardino Mtns 80 71 0.6 39 10 34 101 37 C San Bernardino Mtns 85 74 0.6 37 9 37 112 38 Big Bear Lake 71 66 0.5 34 10 32 87 San Bernardino County: Mojave Desert Air Basin 39 Phelan 71 68 0.5 35 7 38 93 40 Hesperia 65 61 0.5 35 10 39 71 41 Trona 62 54 0.3 35 29 30 87 42 Victorville 58 57 0.5 35 10 40 58 43 Yucca Vly 60 57 0.3 33 12 25 58 44 Barstow 57 54 0.4 27 11 46 50 45 Twentynine Palms 55 54 0.2 32 10 23 50 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- AIR QUALITY FORECAST -------------------------------------------------------------------------------- ON MON., SEP. 20, 2021, THE SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT PREDICTS THE AIR QUALITY WILL BE ... GOOD in the following area(s): Antelope Valley AQI: 47 Ozone MODERATE in the following area(s): Banning Pass Area AQI: 93 Ozone Big Bear Lake AQI: 87 Ozone Central Mojave Desert AQI: 58 Ozone Coachella Valley/Low Desert AQI: 71 Ozone Coastal Area AQI: 57 PM2.5 Inland Orange County AQI: 84 Ozone Metropolitan Area AQI: 77 Ozone Northern Mojave Desert AQI: 87 PM2.5 San Gabriel Mountains AQI: 100 Ozone Temecula/Anza Area AQI: 80 Ozone Victor Valley AQI: 93 Ozone UNHEALTHY FOR SENSITIVE GROUPS in the following area(s): Hemet/Elsinore Area AQI: 126 Ozone Riverside Valley AQI: 143 Ozone San Bernardino Mountains AQI: 112 Ozone San Fernando/Santa Clarita Valleys AQI: 115 Ozone San Gabriel Valley AQI: 122 Ozone UNHEALTHY in the following area(s): San Bernardino Valley AQI: 164 Ozone ------------------------------------------------------------------------ ------------------------------------------------------------------------ WEATHER FORECAST ------------------------------------------------------------------------ On Monday, the weather will be warmer. Weak Santa Ana conditions will push easterly winds through the passes and along the coastal mountain slopes. Inversion Base: 486 FT | Breaking Temperature: 75 DEG F Inversion Breaking: YES | Maximum Mixing HEIGHT: 1999 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 MONDAY, SEPTEMBER 20, 2021 IN THE SOUTH COAST AIR BASIN.