Ratios of PM2.5 concentrations measured during driving and active commutes
PM2.5 concentrations were measured during driving, walking and cycling commutes using Earthsense zephyrs. Four routes were taken.
Measruements were averaged by trip and ratios of PM2.5 in car to active commute (i.e PM2.5 car/ PM2.5 walking or PM2.5 car/ PM2.5 cycle) were calculated for each trip and route.
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