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The image presents nitrogen oxide emissions (g/km) against speed (kph) for diesel cars, petrol cars, lorries, and buses. Diesel cars start at 40 g/km at 10 kph, decreasing to about 8 g/km at 70 kph, then increasing steadily to 43 g/km at 130 kph. Petrol cars maintain relatively constant emissions from 5 g/km at 10 kph to around 8 g/km at 130 kph. Lorries start at 36 g/km at 10 kph, decline to a low of 16 g/km at about 70 kph, and rise to 33 g/km at 130 kph. Buses' emissions range from 11 g/km at 10 kph to 13 g/km at 130 kph, with a slight increase observed around 90 kph and above.
Given the complexity of the image, the above description may not be entirely accurate.
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The line graph illustrates the amount of nitrogen oxide emissions which depended on the speed of the vehicles. The type of vehicles is divided into Diesel car, Petrol car, lorries and bus.
It is immediately noticeable that the largest gas emission was occupied by buses while diesel car made up the smallest amount of producing nitrogen oxide.
According to the graph, it is apparent that buses and lorries which the quantity of gas emission of bus more than lorries about 7 g/km at 40 g/km. After the start point, both lines saw significant decrease to roughly a 25 g/km at 60 kph before bus’s gas releasing rose dramatically to just over the start point level which accounted for double of lorries at maximum speed.
The petrol car and diesel car graphs remained stable throughout the period with 10 g/km and 5 g/km respectively.
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