Smoke over the Bay on Wednesday came from a planned burn on Angel Island — what Los Gatos homeowners should know

If you noticed smoke or a haze toward the north on Wednesday, there was no wildfire behind it. It came from a prescribed burn on Angel Island — the largest island in San Francisco Bay, about 50 miles north of Los Gatos — where fire crews were deliberately clearing dry grass and brush.

What happened

Fire crews resumed a planned burn on Angel Island on Wednesday, two weeks after it was paused. CAL FIRE, the Marin County Fire Department and California State Parks began the operation on September 8 with a goal of treating 260 acres, but stopped after about 62 acres following discussions with the Bay Area Air Quality Management District.

Wednesday brought a new weather window. Crews treated another 85 acres before stopping at about 2:15 p.m., Bay City News reported, and no more burning is planned for the rest of this week. Roughly 100 acres remain, to be finished on a later day with favorable conditions.

How far the smoke travelled

The smoke was heaviest in San Francisco and the East Bay. KALW reported elevated air-quality readings in parts of central and eastern San Francisco, and the cities of Richmond and San Pablo sent alerts to residents. Hindustan Times reported that residents as far south as San Jose and Santa Clara also noticed smoke. State Parks says smoke from a burn day can stay visible for up to three days.

Why burn on purpose

The burns target grassland and coastal scrub — dry fuel that builds up when an area goes years without the small, low-intensity fires it once had. CAL FIRE Division Chief Sean Jerry described the goal of the first phase as "reducing the chance of a catastrophic fire on the island." Marin County Fire has made the practical case too: clearing dry vegetation now means a future fire there would take far fewer engines to control. Each burn day is scheduled with the Bay Area Air Quality Management District and depends on weather that will carry smoke up and away.

If you see smoke from a planned burn

• Don't call 911 about Angel Island smoke. State Parks asks residents not to, so emergency lines stay clear for real emergencies.
• If the smell bothers you, KALW's advice was to stay indoors, close windows and run an air purifier if you have one.
• For updates, State Parks points to the Angel Island State Park website and social accounts, and the Watch Duty app.

Why it matters in Los Gatos

Los Gatos is not the flat valley floor. Its hillside neighborhoods climb into the Santa Cruz Mountains, where wildfire risk is part of owning a home rather than a headline from across the Bay. Every California home sale comes with a Natural Hazard Disclosure stating whether the property sits in a state-mapped very high fire hazard severity zone or a wildland area, and state law requires defensible space — cleared vegetation — around homes in those zones. The same principle behind the Angel Island burn, applied one lot at a time. If you are buying in the hills, that disclosure is worth reading line by line before you write an offer.

Tim McMullen · CA DRE #02016832
[email protected] · (415) 691-9272