CPAP Users in Wildland Fire Environments 2026

People using CPAP (Continuous Positive Airway Pressure) devices on wildfire assignments have reported that their equipment failed to provide therapeutic benefit within days of deployment. CPAP filters are rated for household air quality, not outdoor wildland fire air quality. Wildfire smoke—particularly at Particulate Matter (PM) 2.5 concentrations sustained above 150 μg/m³ during active fire operations—saturates disposable and reusable CPAP filters within 24 to 72 hours. Clogged filters and contaminated equipment cause an increased delivery of harmful particles directly to the airway and increases the human health impacts to your lungs from related irritants and pollution. Clogged filters also cause decreased airflow rates and decreased oxygen exchange that will cause a decline in cognitive function and muscle recovery.