The line chart presents the amount of released nitrogen oxide from four different vehicles at divergent paces.
Overall, most of carbon footprint is contributed by trucks and buses, which have low carbon emission rates in initial kilometres and display a reverse trend in high speed. In addition, regardless of velocity, the amounts of nitrogen oxide released from diesel cars and gasoline cars remain stable in minor values with negligible changes.
According to the chart, the volume of greenhouse gas emitted from gasoline cars gently decreases from 11 g/km at 10 km/h to 9 g/km at 65 km/h and 8 g/km at 95 km/h. Since this point, the figure for gasoline cars starts to increase gradually to its peak, at 12 g/km in 125 km/h. Similarly, the quantity of emissions from diesel cars falls slightly to 5 g/km and maintains that number until the speed of 130 km/h.
The level of byproduct gas from trucks drops gradually when their speed is getting higher and from the trough at 16 g/km at 85 km/h, this number begins to rise significantly to 25 g/km at 130 km/h. While that of buses also decreases sharply from 40 g/km in 5 km/h to 26 g/km in 55 km/h and then jumps dramatically to its peak at 44 g/km in 130 km/h.
