After the Wildfire: How Soot and Ash Compromise Indoor Air Quality

When a wildfire passes through Southern California, the smoke doesn't just clear when the sky turns blue again. Soot and ultrafine ash settle into HVAC systems, upholstery, insulation, and the cavities behind your walls — and they keep off-gassing volatile compounds for weeks. Wiping down counters and changing a filter barely scratches the surface. We've walked into homes six months post-fire where occupants were still getting headaches and sore throats because nobody cleaned the duct runs or the attic insulation. Here's what professional soot remediation actually involves, why HEPA vacuuming and thermal fogging matter, and how to know when your home is genuinely safe to breathe in again.