The chart below shows the nitrogen oxide emissions of four different vehicles at different speed. Summarize the information by selecting and reporting the main features, and make some comparisons where relevant.

The chart illustrates the nitrogen oxide emissions from four vehicle types—diesel cars, gasoline cars, trucks, and buses—across varying speeds ranging from 0 to 130 km/h. Overall, diesel cars emit the least and most stable amount of nitrogen oxide out of the four across different speed. Buses and trucks emit the most, slump the emission amount […]