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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 shows the amount of nitrogen oxide emissions from four types of vehicles (buses, lorries, petrol cars, and diesel cars) at different speeds, measured in grams per kilometer.
Overall, buses emit the highest levels of nitrogen oxide, while diesel cars produce the least. In general, emission levels for most vehicles change depending on their speed, with some showing U-shaped trends.
Buses emit around 40g/km at 10 km/h. As speed increases to about 60 km/h, emissions fall to just under 30g/km, but then rise again sharply, peaking at 45g/km at 130 km/h.
Lorries follow a similar trend but start slightly lower at 33g/km at low speeds. Emissions decrease to 20g/km at around 60 km/h, then rise again to 25g/km at 130 km/h.
Petrol and diesel cars emit significantly less. Petrol cars begin around 10g/km and remain fairly stable, with slight fluctuations. Diesel cars are the cleanest, starting just above 5g/km and staying relatively constant across all speeds.
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