The graph below describes how vehicle type and speed affect nitrogen oxide emissions. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The line graph illustrates the amount of nitrogen oxide produced by four different types of vehicles at various speeds. Overall, it is clear that buses are the highest emitters across all speeds, while diesel cars produce the lowest emissions. Additionally, all vehicles show a similar pattern where emissions are highest at very low and very […]