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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 line graph illustrates the nitrogen oxide gas emitted by four types of vehicles through their speed.
In overall, buses and lorries produced more gas with high speed while petrol cars and diesel cars emitted the lesser consistent gas with high speed.
The much less gas emitted by public commute vehicles and the trucks, the higher the speed they drive. It seems that it is kept for 26g/km at 55kph of speed for buses and then it went up significantly to emissions of nearly 43g/km at 125kph of speed. For lorries, the emissions kept the decreasing trend until 17g/km at 85kph of speed. Then, it went slightly up at 125kph with the emission of 24g/km.
Diesel cars produced a little high rate of emission at a lower speed rate from 5kph to 35kph. After that, they kept the same constant rate at 5g/km up to the speed rate of 125kph. Petrol cars had the similar trend of diesel cars and produced gas 11g/km at 5kph and kept decreasing until 9g/km at 95kph. Then, the emission rate went slightly up at 12g/km at 130kph.
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