Fig. 1
From: Particulate matter exposure and health impacts of urban cyclists: a randomized crossover study
Quintiles for each individual cycling trial (of the 22 participants with complete heart rate and minute ventilation profiles), normalized across all participants, of the locations of highest and lowest a PNC levels, b Ventilation, c Intake (PNC x Ventilation). The start location is indicated by a diamond and arrows indicate the direction of travel (the Residential route was travelled in both directions)