# Protecting Indoor Air Quality During Bay Area Wildfire Season
Wildfire smoke is an annual reality for Bay Area residents. Your HVAC system plays a crucial role in maintaining healthy indoor air during fire season.
Understanding Wildfire Smoke
Wildfire smoke contains: - Fine particulate matter (PM2.5) - Carbon monoxide - Volatile organic compounds - Other harmful pollutants
These particles are small enough to penetrate deep into your lungs, making filtration critical.
HVAC Strategies for Smoke Season
Upgrade Your Filter During fire season, upgrade to at least MERV 13 filter: - MERV 13 captures 85%+ of smoke particles - Check filter compatibility with your system - Change filters more frequently during smoke events
Run Fan Continuously Set your thermostat fan to "ON" instead of "AUTO" to: - Continuously filter air - Maintain consistent air quality - Keep positive pressure indoors
Seal Your Home - Keep windows and doors closed - Use weatherstripping to seal gaps - Close fireplace dampers - Consider adding door sweeps
Create a Clean Room Designate one room with: - Extra filtration (portable HEPA filter) - Minimal windows - Sealed door gaps - Space for family during severe smoke events
Air Purification Options
Whole-Home Solutions - **HEPA filtration systems** - Hospital-grade air cleaning - **Electronic air cleaners** - Effective against fine particles - **UV air purifiers** - Kill airborne pathogens - **Ionizers** - Help settle particles
Portable HEPA Filters For supplemental protection: - Choose CADR rated for your room size - True HEPA captures 99.97% of particles - Run continuously during smoke events - Place in bedrooms for better sleep
Monitoring Air Quality
Resources - AirNow.gov - Real-time air quality index - PurpleAir.com - Local sensor network - Bay Area Air Quality Management District alerts
AQI Guidelines
| AQI | Status | Actions |
|---|---|---|
| 0-50 | Good | Normal activity |
| 51-100 | Moderate | Sensitive groups limit outdoors |
| 101-150 | USG | Reduce outdoor activity |
| 151-200 | Unhealthy | Avoid prolonged outdoor activity |
| 200+ | Very Unhealthy | Stay indoors, maximize filtration |
HVAC Maintenance During Fire Season
Weekly Tasks - Check filter condition - Monitor airflow at vents - Clean outdoor unit if accessible
After Smoke Events - Replace filter - Consider professional duct cleaning - Clean or replace outdoor unit filter screen
Long-Term Solutions
For Frequent Smoke Exposure Consider installing: - Whole-home HEPA filtration - ERV with HEPA filter for ventilation - Upgraded ductwork sealing - Air quality monitors
Home Improvements - High-quality weatherstripping - Better window seals - Improved door gaskets - Attic sealing
Protecting HVAC Equipment
Outdoor Units - Cover condenser during heavy smoke (if not running) - Clean coils after smoke events - Check for ash accumulation
Indoor Units - Change filters frequently - Schedule post-season tune-up - Consider coil cleaning
When to Evacuate
Your HVAC can't protect against: - Direct fire threat - Extreme AQI (500+) for extended periods - If you have severe respiratory conditions
Follow local evacuation orders and air quality advisories.
Summary
Your HVAC system is your best defense against wildfire smoke. Upgrade filters, run fans continuously, seal your home, and consider adding supplemental air purification. Stay informed about air quality conditions and take action early during smoke events.