Figure 2From: Air pollution and general practitioner access and utilization: a population based study in Sarnia, 'Chemical Valley,' Ontario Box-plot diagrams of NO2, SO2, and BTEX values for respondents based on Land Use Regression Models within categories of general practitioner (GP) utilization and regular GP Access. Solid lines across panels represent pollutant average and inside boxes the median. (○): 1.5-3 times Interquartile range; (★) 3 or more times interquartile range.Back to article page