Nitrogen Oxide Emissions By Four Vehicles

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The line graph compares the amount / quantity of nitrogen oxide emitted by different types of vehicles at different levels of speed. Overall, it is evident that diesel car produced the least amount of emission whereas buses were responsible for generating the highest amount/quantity of emissions at varying speed. To begin with, at 10 km/hr speed, a diesel car produced 7g of nitrogen oxide per kilometer. The level of emission decreased slightly as the speed increased and at speeds starting from 50 km/hour, it remained 5g/km. The petrol car emitted higher amounts of nitrogen oxide. At 10 km/hr speed, it produced a little over 10g of nitrogen oxide per kilometer. As the speed increased, the quantity of emission decreased slightly and at 80 km/hr speed, it was about 9g/km. Interestingly, at speeds above 110km/hr, the rate of emission of nitrogen oxide increased. On the other hand, in the case of buses and lories, there is considerable variation in the amount of nitrogen oxide produced at different speeds. For lories, the emission level was the highest (33g/km) at 10km/hr speed and reached the lowest (17g/km) at 90km/hr speed. The rate of emissions increased again at speeds above 90km/hr and it was 5g/km at 130km/hr speed. Buses pollute the most. At 10 km/hr speed, they produced 40g/km of nitrogen oxide. Emission level was the lowest (6g/km) at 60km/hr speed and it increased dramatically at higher speeds. At 130km/hr speed, buses were producing as much as 43g/km of nitrogen oxide.

Manjusha Nambiar

Hi, I'm Manjusha. This is my blog where I give IELTS preparation tips.