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The image displays a line graph with speed in kph on the x-axis ranging from 10 to 130 in increments of 10, and nitrogen oxide emissions in (µg/km) on the y-axis ranging from 0 to 45 in increments of 5. There are four lines representing different vehicles: diesel cars with the highest emissions starting at 40, peaking at 42 around 50 kph, decreasing to 30 at 90 kph, rising back up to 35 at 130 kph; petrol cars starting at approximately 10, rising to a peak of 15 at 50 kph, falling to 5 at 90 kph and ending at 10 at 130 kph; lorries beginning at about 35, peaking at around 38 at 50 kph, dropping to 30 at 90 kph, and concluding at 35 at 130 kph; and buses starting at approximately 25, peaking just above 30 at 50 kph, decreasing to around 20 at 90 kph, and finishing at 25 at 130 kph.
Given the complexity of the image, the above description may not be entirely accurate.
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The graph illustrates the nitrogen oxide emissions that are produced by the four types of vehicles such as diesel cars, petrol cars, lorries and buses.
Overall, the amount of nitrogen oxide gas emitted by diesel cars and petrol cars shows minimal variation whereas emissions by both buses and lorries show a rapid decline before starting to rise again.
Compared with other vehicles, buses emitted the highest amount of gas 40(g/km) at a speed of 109(kph) and then it dropped to 25(g/km) at 60 kph. After that it had a steady increase till it reached around 43(g/km) at the speed of 130 (kph).
Petrol cars had a similar trend with buses which initiated with the 34(g/km) at 10(kph) and fell gradually to the lowest point of 16(g/km) at 90(kph) before it started to rise steadily.Unlike the trends for buses and lorries, diesel cars and petrol cars remained stable with the difference of 5(g/km).
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