Fig. 2
From: The pulmonary and autonomic effects of high-intensity and low-intensity exercise in diesel exhaust
FeNO prior to and following a rest, b low-intensity, or c high-intensity cycling in FA or DE. Significance is set at p < 0.05. β = significantly greater than pre-exercise in the corresponding exposure, occurs only in DE (diesel exhaust) only; ϕ = significantly less than post in the corresponding exposure (FA (filtered air) only)