This advisory is in effect through Saturday morning. Southern California Air Quality Management District will issue an update if additional information becomes available.

The Holy Fire is burning to the east of Trabuco Canyon near the border of Orange County and Riverside County within the Cleveland National Forest. The burn area is currently reported at about 18,000 acres with 5 percent containment. Winds are from the west/southwest Friday before transitioning to a southerly wind during the overnight hours. During the overnight and early morning hours, downslope winds may bring smoke and ash into the valleys adjacent to the fire.

Overall, meteorological conditions may bring smoke into portions of Orange County, Riverside County, and San Bernardino County. Air quality may reach Unhealthy levels or higher in areas directly impacted by smoke.

Areas of direct smoke impacts and Unhealthful air quality may include portions of:

Orange County: Areas 16 (Northern Orange County), 17 (Central Orange County), 18 (North Coastal Orange County), 19 (Saddleback Valley), 20 (Central Coastal Orange County), and 21 (Capistrano Valley).

Riverside County: Areas 22 (Corona/Norco), 23 (Metropolitan Riverside), 24 (Perris Valley), 25 (Lake Elsinore), 26 (Temecula Valley), 28 (Hemet/San Jacinto Valley), and 29 (Banning Pass).

San Bernardino County: Areas 32 (Northwest San Bernardino Valley), 33 (Southwest San Bernardino Valley), 34 (Central San Bernardino Valley), 35 (East San Bernardino Valley), 36 (West San Bernardino Mountains), 37 (Central San Bernardino Mountains), and 38 (East San Bernardino Mountains).

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