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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 amounts of nitrogen oxide emitted by four different vehicle types at diverse speeds.
Overall, all the vehicles experienced different trends except for Petrol car and Diesel car. While the nitrogen oxide emissions by Buses and Larries rose with some fluctuations, the Petrol and Diesel car stayed steady throughout the period.
As the graph shows, the Buses’ figure started at 40g/km at the speed of 10 kph, followed by a considerable drop to 25 at the speed of 60 kph. Then, it climbed to nearly 45 g/km at a speed of 130. Regarding Larries’s emissions, it started at 33 g/km at 10. Then it fell to approximately 17 g/km at 90 speed.afterward, the figure experienced a dramatic rise to 25 at the end of the period.
By contrast, There was no change in the amount of nitrogen oxide emitted from Petrol car and Diesel car and their figures stayed steady throughout the period,however, the amount of nitrogen oxide emitted by Petrol car was higher than Diesel car, while the Diesel car emitted 6 g/km nitrogen oxide which was 4 g/km lower than Petrol car.
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