Figure 5. Deposition rate of PM₁₀ in the respiratory tract at rest and during a marathon run.

Levels of deposition rate of PM₁₀ in the respiratory tract at rest and during a marathon race, performed by an average runner (4 h: 30 min) as well as by an elite marathon runner (2 h: 00 min). Notice also the levels of simulated PM₁₀ content in the air, required to increase the rate of PM₁₀ deposition in the respiratory tract of runners at rest to the level witnessed during marathon races (50 µg m⁻³ vs. 251 µg m⁻³ vs. 466 µg m⁻³). Where: V_E –minute ventilation; Volume - the volume of the air filtered by respiratory tract during the time of exercise, PM₁₀ –the mass concentration of particles with an aerodynamic diameter smaller than 10 µm, DF_{At rest} –the average mass deposition fraction of PM₁₀ for a male at rest, DF_Exercise –the average mass deposition fraction of PM₁₀ for an exercising male.