Figure 1 (IMAGE)

University of Oxford

Figure 1

Caption

Pollution generated per kilometre by used vehicle fleets. Exported cars (orange) generate at least 13-24% more CO2 per kilometre (a), similar average but (through overdispersion) higher median fine particulate matter pollution (b), and (c) at least 53% more nitrogen oxides per kilometre than scrapped (green) or on-road (blue) vehicle fleets. Both exported car and LGVs fleets also have larger observed engine capacities (d) and worse fuel efficiency (e) despite being similar ages to on-road fleets and much younger than contemporary scrapped vehicles (f). Boxes show interquartile range (IQR), whiskers are 1.5x IQR, sample size (millions) on uppermost x-axes, summary data supplied in figshare repository.

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Nature

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