Ratios of NO2 concentrations measured during driving and active commutes

NO2 concentrations were measured during driving, walking and cycling commutes using Earthsense zephyrs. Four routes were taken.

Measruements were averaged by trip and ratios of NO₂ in car to active commute (i.e NO₂ car/ NO₂ walking or NO₂ car/ NO₂ cycle) were calculated for each trip and route.