Ratios of PM2.5 concentrations measured during driving and active commutes
<p>PM<sub>2.5</sub> concentrations were measured during driving, walking and cycling commutes using Earthsense zephyrs. Four routes were taken.</p>
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<p>Measruements were averaged by trip and ratios of PM<sub>2.5</sub> in car to active commute (i.e PM<sub>2.5</sub> car/ PM<sub>2.5</sub> walking or PM<sub>2.5</sub> car/ PM<sub>2.5</sub> cycle) were calculated for each trip and route. </p>
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