How to Protect Pulmonary Fibrosis from Wildfire Smoke

Wildfire smoke poses a serious threat to people with Idiopathic Pulmonary Fibrosis (IPF, a disease where the lungs become scarred and stiff), as the tiny particles in smoke can accelerate lung damage ^[1]. While this reality can feel overwhelming, taking proactive, evidence-based steps to manage your environment can effectively protect your lungs and reduce the risk of severe breathing crises ^[2][3].

The primary danger in wildfire smoke is particulate matter 2.5 (PM2.5, microscopic particles 2.5 microns or smaller that can travel deep into the lungs and even enter the bloodstream). In people with IPF, exposure to these particles—along with other pollutants like nitrogen dioxide (NO2, a toxic gas found in smoke and smog)—is linked to a faster decline in lung function and a higher risk of the disease progressing ^[4][5][6]. Furthermore, research has found actual particulate matter embedded in the lung tissue of IPF patients, suggesting a direct physical link between dirty air and lung damage ^[7].

Most importantly, breathing wildfire smoke significantly increases your risk for an acute exacerbation (a sudden and dangerous worsening of IPF symptoms that often requires hospitalization) ^[1][8]. Because these exacerbations can be life-threatening and drive disease progression, focusing on prevention during smoke events is essential ^[9].

Creating a Safe Indoor Environment

When the air outside is hazardous, your home needs to become a safe haven. Keeping PM2.5 out of your indoor air can help reduce the severity of symptoms ^[2].

• Use HEPA air purifiers: Portable High-Efficiency Particulate Air (HEPA) cleaners have been shown to substantially decrease PM2.5 concentrations indoors ^[3]. Place one in the room where you spend the most time, and another in your bedroom.
• Upgrade your HVAC filters: If you have central air conditioning, use filters rated MERV 13 or higher, which are dense enough to trap microscopic smoke particles. Ensure your system is set to recirculate indoor air rather than pulling in fresh air from outside, and consider switching the fan setting to “ON” rather than “AUTO” so it continuously filters the air.
• Keep windows and doors closed: Seal any drafty windows or doors to prevent smoke from seeping inside.
• Avoid indoor pollution: Do not burn candles, use gas stoves, vacuum (unless using a HEPA-filtered vacuum), or fry food, as these activities can create additional indoor particulate matter.
• Stock an emergency supply: Keep an emergency reserve of groceries, antifibrotic medications, and extra oxygen tanks stocked ahead of wildfire season so you completely eliminate the need to leave the house during a severe smoke event.

Navigating the Outdoors

If you must go outside during a smoke event, you need to take extra precautions, as standard air quality guidelines may not be protective enough for someone with a chronic lung disease ^[10].

• Monitor the Air Quality Index (AQI): Check AQI forecasts daily using local apps or websites so you can plan necessary errands before smoke arrives. When the AQI reaches the “Unhealthy for Sensitive Groups” category, it is best to stay indoors. If your IPF is severe, you may even need to take precautions when the air is merely in the “Moderate” range.
• Wear appropriate masks: An N95 or KN95 respirator can filter out fine smoke particles. While studies show that wearing an N95 mask does not significantly drop blood oxygen levels for most people at rest ^[11][12], it can increase your breathing rate, cause sensations of fatigue, and make you feel more short of breath—especially if your lung function is already compromised ^[13][14].
• Considerations for supplemental oxygen: If you use supplemental oxygen, be aware that a nasal cannula prevents an N95 from sealing properly against your face, rendering it ineffective at filtering smoke. Attempting to wear a tight-fitting mask over or under a cannula can also dangerously increase the work of breathing for patients with advanced IPF. If you use oxygen, it is safest to strictly avoid outdoor exposure during smoke events rather than rely on a mask.
• Limit exertion: Do not exercise or do strenuous chores outside when it is smoky, as heavier breathing pulls more particles deeper into your lungs.

Medical Management and Preparedness

Because IPF restricts your lungs’ ability to transfer oxygen, environmental stressors require careful medical monitoring and advanced planning.

• Use a pulse oximeter: Monitoring your oxygen saturation (the percentage of your blood loaded with oxygen) at home can help you spot drops in oxygen early. Work with your doctor to establish your normal baseline oxygen level and clarify exactly which number (e.g., dropping below 89%) should trigger you to use your action plan.
• Have an action plan: Work with your pulmonologist ahead of time to create a plan for smoke season. This should detail when to contact your clinic, when to go to the emergency room, and whether your supplemental oxygen flow rate needs adjusting during a flare-up ^[15][16]. (Note: Current clinical guidelines do not have a standardized oxygen protocol specifically for wildfire smoke, making an individualized plan with your doctor crucial ^[15]).
• Prepare for power outages: If you rely on an oxygen concentrator, register with your local utility company for priority power restoration in case of wildfire-related outages, and ensure you have a “go-bag” packed with portable oxygen tanks.
• Maintain your treatment regimen: Do not stop your antifibrotic medications unless directed by your doctor.