Recent research has revealed that air passengers are often exposed to extremely high levels of ultrafine particle (UFP) pollution during taxiing and on the runway. These ultrafine particles, smaller than 100 nanometers (0.1 micrometers), can easily bypass conventional filters and penetrate deep into the lungs, potentially leading to long-term health risks.
Although N95 masks are primarily designed to filter particles as small as 0.3 micrometers (300 nanometers), they still provide a significant level of protection against ultrafine particles. Due to the effect of Brownian motion, N95 masks can capture even smaller particles more effectively than expected.
The concentration of ultrafine particles is particularly high during taxiing, especially when a plane is idling or behind another aircraft. Aircraft engines release a mix of pollutants, including particulate matter (PM), volatile organic compounds (VOCs), and fuel vapors. These pollutants, especially VOCs, can infiltrate the cabin, significantly degrading air quality during takeoff and landing.
While PM2.5 levels are commonly measured at airports, these particles do not directly correlate with ultrafine particles, which are harder to detect. PM2.5 is often used as an indirect measure for ultrafine particles, as their presence is linked to the concentration of smaller particles. However, the health risks associated with ultrafine particles are more closely related to their number and surface area than to their mass.
Although N95 masks aren't perfect at filtering ultrafine particles, they still offer effective protection against various airborne pollutants. Wearing an N95 mask during taxiing, takeoff, and landing can help reduce exposure to both particulate matter and harmful VOCs. For passengers who are particularly sensitive to air pollution, such as those who experience nausea or respiratory symptoms, this simple precaution can provide valuable protection against the high levels of ultrafine particle pollution present during these phases of flight.
