Why air pollution is much more serious problem in delhi?
Answers
More than half of Delhi's particulate matter [2.5] come from vehicles - either through road dust or exhausts. The road dust comes up primarily when the tires kick the edge of road or the broken remnants of an overstressed road. Badly maintained Diesel vehicles are the biggest source of the exhausts.
Delhi had 7.5 million vehicles in 2012 [more than 8.5 million in 2015] and this is easily the largest in India and probably the highest in the world. To put in perspective this is nearly 4 times more than Mumbai and nearly 5 times that of Ahmedabad. The mix of cars in the vehicles is also far more in Delhi. Chennai has a larger percentage of two-wheelers than Delhi. Delhi's is also 1.5 times more than Beijing's although many of Delhi's vehicles are less polluting two-wheelers than Beijing's. [