The line graph depicts the amount of nitrogen oxide emissions caused by four distinct categories of transportations at different speeds.
Overall, while lorries and buses present dramatic fluctuations and the final increases, the two others exhibit slight changes: a minor rise for petrol cars and a small reduction for diesel cars.
At the speed of kph10, buses record the largest number of nitrogen oxide emissions at a remarkable 40(g/km), followed closely by an approximately 33(g/km) of lorries. Notably, petrol cars only reflect 10(g/km), underscoring a modest figure of diesel car, which stands at around 6(g/km).
To the 60(kph) speed, buses capture a moderate decrease to roughly 25 grams of nitrogen oxide emissions per kilometer, then gradually grow to nearly 45 according to the rise of the speed to 130(kph). A similar trend can be seen in lorries, whose amount of nitrogen oxide emissions reach the lowest level of nearly 17(g/km) at 90(kph) before noticeably increasing to 25(g/km) at 130(kph). At the highest speed, the quantity of nitrogen oxide emissions in petrol cars slightly rises to about 12(g/km), highlighting a tiny drop to 5 (g/km) of diesel cars.