Regional wildfire smoke — the defining pattern.
Oak Park sits entirely within the Very High Fire Hazard Severity Zone and takes seasonal smoke loading. Ash and soot enter through HVAC, attic vents, and window seals during regional fire events. Soft goods absorb — carpet, drapes, upholstery, bedding, clothes — and odor settles into building materials. Wildfire smoke composite chemistry is more aggressive than wildland-only smoke.