The line graph illustrates the nitrogen oxide emissions, measured in grams per kilometer, released by four different types of vehicles ( Diesel Car, Petrol Car, Lorries, and Buses) at various speeds ranging from 10 to 130 kilometers per hour.
Overall, Diesel Car consistently produced the highest levels of nitrogen oxide, while buses generated the lowest amounts. Additionally, compared to other vehicles, Diesel cars released nitrogen oxide emissions regardless of their speed.
As can be seen from the graph, the nitrogen oxide emissions from Diesel cars begining at 40 g/km at 10 kph, then declined significantly to 25 g/km at 60 kph. Subsequently, they increased again to nearly 45 g/km at 130 kph. Regarding Petrol Car emissions, they started at 33 g/km at 10 kph. and then decreased to approximately 17 g/km at 90 kph before experiencing a sharp rise to 25 g/km at the highest speed of 130 kph.
Turning to the emissions of Lorry vehicles, they maintained relatively stable emissions of around 12g/km throughout most speeds. Meanwhile, Buses consistently produced the lowest nitrogen oxide production, starting at around 7 g/km and then dropping to approximately 5 g/km. Most of the rest of the speeds, the amount of nitrogen oxide emissions by buses remained unchanged.