Extended Data Figure 6: Review of diesel NOx emission factors.
From: Impacts and mitigation of excess diesel-related NOx emissions in 11 major vehicle markets
a, HDV in EU-28. (Data are taken from refs 17, 34, 44, 15 and 33. We note that ref. 17 indicates that remote sensing estimates are typical of urban driving conditions in the UK.) b, HDV in China. (Data are taken from refs 73, 74, 36, 38 and 37.) c, Passenger cars in EU-28. (Data are taken from refs 75, 34, 76 and 17.) Emission limits are from corresponding regulations. Data from ref. 75 are averaged over urban, rural and highway for diesel cars weighing 2.5–3.5 tons.) d, Light commercial vehicles in EU-28. (Data are taken from refs 75 and 34.) In a and b, horizontal lines indicate distance-based emission factors based on engine emission limits. In a and b, horizontal bars indicate upper and lower bound for emission factor estimates, calculated as described in the Methods.
