I totally agreed that the use of public transport more often than driving own car will greatly reduced air pollution. According to what I found out from Wikipedia a single deck bus in Singapore is able to carry 86 passengers, and the MRT train in Singapore is able to carry 1920 passengers. If we convert this amount of passengers to the number of 5-seated car needed to carry them around, we will need a total of 401 cars to bring them around, when only 1 bus and train is needed to do this job.
Furthermore, the population of Singapore was about of 4 million in 2007. If every 5 people owns a car, there will be approximately 0.8 million cars traveling on the road. Since Singapore is a small island, with this amount of cars traveling around traffic jam will definitely occur all the time. When traffic jam occur the operation time of a car will increase. With car operation time increased more greenhouse gases will be emitted out because the times of emission of gases increased.
On the other hand, if all people use public transport, there will be only 2000 train and bus traveling around Singapore. Since MRT train move on its own railway network and does not travel on road, and with only 2000 bus traveling on the road there will be lesser chance of get traffic jam. So with little chances of getting traffic jam, the operation time of transport decreases. With operation time decreases less greenhouse gases will be emitted out because the times of emission of gases decreased.
To sum up, with a reduction of 0.8 million cars to 4000 public transports traveling around in Singapore air pollution in Singapore will definitely reduce. It is because the amount of gases emitted is directly proportional to the amount of transports used and the usage time of each transport.
source:www.permatopia.com/wetlands/traffic.html
(my blog buddy was Ken)
picture source:
www.enviroblog.org/2007/04/