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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 produced by Diesel, Petrol cars, Lorries, and Buses.
Overall, Diesel Cars maintained their position at the top of nitrogen oxide emissions followed by petrol cars. Lorries and Buses also showed relatively stable at the speeds.
At 10 kph , Diesel car emit 40 g/km of nitrogen oxide, then decrease minimum of around 25 g/km at 60 kph before rising steadily to reach roughly 42 g/km at 130kph. Meanwhile, Petrol car consistently reduce emissions until 90kph before climbing to about 22 g/km at 130kph
on the other hand, Lorries and Buses maintain relatively stable nitrogen oxide emission throughout the period. But, Lorries consistently emit higher nitrogen oxide than buses do.
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