Ratios of O3 concentrations measured during driving and active commutes

O₃ concentrations were measured during driving, walking and cycling commutes using Earthsense zephyrs. Four routes were taken.

Measruements were averaged by trip and ratios of O₃ in car to active commute (i.e O₃ car/ O₃ walking or O₃ car/ O₃ cycle) were calculated for each trip and route.