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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 chart below illustrates how much four vehicles emit Nitrogen Oxide in terms of g/km.
Overall, it is evident that lorries and buses experienced higher emission of Nitrogen Oxide than both diesel and petrol cars.
Looking at the detail, buses are registered as the highest emitter with the number of over 40 g/km by 130 kph, while lorries are recorded as the second one by near 35 g/km by 10 kph. However, there is a significant at above 20 g/km by 60 kph for buses and near 20 g/km by 90 kph for lorries as well.
Conversely, diesel and petrol cars do not show prominent changes between 10 to 30 kph. Once looking at more details, petrol cars have shown that there is only around 10 g/km per 10 kph along with just over that amount although it goes to 130 kph. Besides, diesel cars are registered that they give the data of above 5/km per 10 kph, and it shows it is 5 g/km even though they speed up to 130 kph.
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