Best Ways to Improve Indoor Air Quality During Wildfire Season

Wildfire season in California can bring dangerous smoke and poor air quality right to your doorstep. Even if you’re indoors, harmful particles and irritants can enter your home, affecting your family’s health. Taking simple, proactive steps can help protect your indoor air and keep your living spaces safer during these times.

Don't wait until smoke fills the air to take action. If you're concerned about your home's air quality during wildfire season, Lewis Air Services can help you create a healthier indoor environment. Call (949) 430-7403 or contact us online to schedule an indoor air quality assessment today.

Understanding How Wildfires Affect Your Indoor Air

Wildfire smoke contains tiny particles called PM2.5, which are so small they can slip through standard window seals, door gaps, and even your HVAC system. These microscopic particles can irritate your lungs, trigger asthma attacks, and cause headaches or fatigue. Children, elderly family members, and anyone with respiratory conditions are especially vulnerable.

Even when you can't see or smell smoke outside, these particles may already be circulating through your home. Your air conditioning system can pull in contaminated outdoor air, and everyday activities like cooking or opening doors can introduce additional pollutants. Understanding this invisible threat is the first step toward protecting your family.

Upgrade Your HVAC Filters

Your heating and cooling system is your home's first line of defense against wildfire smoke. Standard air filters aren't designed to catch the tiny particles found in smoke, so upgrading to a high-efficiency filter makes a significant difference.

Look for filters with a MERV rating between 11 and 13. These ratings measure how well a filter captures small particles:

MERV 11–13 filters trap smoke particles, pollen, and mold spores
They fit most residential HVAC systems without modifications
Replace them every 1–2 months during wildfire season (more often if air quality is poor)

Before upgrading, check with an HVAC professional to ensure your system can handle a higher-rated filter. Some older systems may struggle with the increased airflow resistance, which can reduce efficiency or cause damage.

Seal Air Leaks Throughout Your Home

Preventing smoke from entering your home is easier than trying to filter it out later. Small gaps around windows, doors, and vents act like highways for polluted outdoor air.

Take these sealing steps:

Apply weatherstripping to doors and windows
Use caulk to seal cracks in walls, especially around utility entry points
Install door sweeps at the bottom of exterior doors
Check attic hatches and basement entries for gaps

Don't seal your home so tightly that you create moisture problems or trap stale air. You need some ventilation for safety and comfort, but strategic sealing reduces the amount of contaminated outdoor air that enters your living space.

Use Portable Air Purifiers Strategically

Portable air purifiers with HEPA filters provide an extra layer of protection in the rooms where your family spends the most time. HEPA stands for High-Efficiency Particulate Air, and these filters capture 99.97% of particles as small as 0.3 microns.

When choosing and using air purifiers:

Select units sized appropriately for your room square footage
Place them in bedrooms, living rooms, and home offices
Run them continuously during heavy smoke days
Keep doors and windows in those rooms closed when possible

Air purifiers work best when paired with a well-maintained HVAC system. They're not a replacement for whole-home indoor air quality solutions, but they provide targeted relief in high-use areas.

Keep Your HVAC System in Peak Condition

A well-maintained heating and cooling system filters air more effectively and runs more efficiently during the extended periods of use that wildfire season demands. Dirty coils, clogged filters, and leaky ducts all reduce your system's ability to maintain clean indoor air.

Schedule professional maintenance that includes:

Thorough inspection of ductwork for leaks or damage
Cleaning of evaporator and condenser coils
Testing of airflow and system performance
Filter replacement or upgrade recommendations

Professional duct services ensure that your entire air distribution system is working properly, preventing contaminated air from bypassing your filters through leaky connections.

Monitor and Control Indoor Humidity

Proper humidity levels between 30% and 50% help your respiratory system function better and make breathing easier when outdoor air quality is poor. Extremely dry air can irritate airways already stressed by smoke exposure, while overly humid conditions can promote mold growth.

During wildfire season, maintaining balanced humidity becomes especially important:

Use a hygrometer to monitor indoor humidity levels
Consider a whole-home humidifier if your home tends to be dry
Run exhaust fans briefly after cooking or showering to prevent excess moisture
Avoid overusing humidifiers, which can create condensation problems

Balanced humidity won't remove smoke particles, but it helps your body cope better with reduced air quality and keeps your respiratory system from becoming overly irritated.

Create a Clean Air Room

When wildfire smoke is at its worst, designating one room as your "clean air sanctuary" gives your family a safe retreat. Choose a room with few windows, no fireplace, and enough space for everyone to gather comfortably.

To create an effective clean air room:

Run a properly sized HEPA air purifier continuously
Keep the door closed except when entering or exiting
Avoid activities that generate particles (cooking, vacuuming, lighting candles)
Use this room for sleeping and resting during the worst air quality days

This strategy is especially helpful for family members with asthma, COPD, or other respiratory conditions who need a reliable space with cleaner air.

Reduce Indoor Pollution Sources

During wildfire season, outdoor air quality is already compromised, so minimizing indoor pollution sources becomes even more important. Everyday activities release particles and chemicals that add to your air quality burden.

Limit these indoor pollutant sources:

Avoid burning candles or incense
Don't use gas stoves without proper ventilation
Skip vacuuming during the worst smoke days (it stirs up settled particles)
Postpone painting, deep cleaning with harsh chemicals, or other projects that release fumes

These temporary changes reduce the total particle load in your home, making it easier for your filtration systems to maintain clean air.

Stay Informed and Prepared

Air quality can change rapidly during wildfire season. Staying informed helps you make timely decisions about when to seal up your home, run air purifiers continuously, or retreat to your clean air room.

Monitor these resources:

AirNow.gov for current air quality index (AQI) readings
Local news for fire updates and evacuation warnings
Your county's emergency alert system
Weather forecasts predicting wind patterns that affect smoke distribution

Keep extra HVAC filters and air purifier filters on hand before wildfire season begins. When smoke events occur, these supplies often sell out quickly at local stores.

Protect Your Family's Health This Wildfire Season

Improving your indoor air quality during wildfire season requires a combination of prevention, filtration, and smart daily choices. From upgrading your HVAC filters to creating a clean air room, each step you take reduces your family's exposure to harmful smoke particles. While you can't control the wildfires or the outdoor air quality, you have significant control over the air inside your home.

Ready to breathe easier this wildfire season? Lewis Air Services offers comprehensive indoor air quality solutions designed for Southern California homes.

Our team can assess your current system, recommend targeted improvements, and ensure your HVAC equipment is ready to protect your family when smoke arrives. Call (949) 430-7403 or reach out online to schedule your indoor air quality consultation.