The given chart demonstrates how a variety of vehicles emit different amounts of nitrogen oxide depending on their speed. The speed and emissions are recorded at kilometers per hours and gallons per kilometer respectively.
It is evident that buses have the largest amount of emissions while diesel cars have the least. Buses highest emissions are 40 g/km at a speed of 10km/h and lowest are 27g/km at a speed of 60km/h. Meanwhile, diesel cars’ highest emissions are barely 10g/km at 10km/h with their lowest emissions being 5g/km at 60km/h.Both buses and lorries are high emitters. Buses begin with an emission of 40g/km at 10km/h. They gradually fall to 27g/km at 60km/h and then proceed to rise to 40g/km at 125km/h. A similar pattern can be see for lorries, which start by emitting 37g/km, then steadily falling to 23g/km and finally rising again to 28g/km.
In contrast, petrol cars and diesel cars have lower emissions that is roughly constant as the speed of the vehicle increases. Petrol cars emit 12g/km at 10km/h. The amount falls just below 10g/km at 60km/h to 80km/h of speed, eventually increasing to 13g/km at 125km/h. Diesel cars express an identical path. Initially, they emits 7g/km. they maintain an emission of 5g/km between the speeds 60km/h and 100km/h. Ultimately, they ascend to 6g/km at 125km/h.