"After Independence of India, Delhi, the capital became major centre of commerce, industry and education. Rapid growth of Delhi resulted in significant increase in environmental pollution. Based on the ambient air quality monitored by the Central Pollution Control Board in 1998, it was found that the contribution from vehicles to the ambient air pollution of Delhi was about 65% of total air pollution. This could be understood from the fact that vehicle population increased from a number of 2,35,000 in 1975 to 21,00,000 in 1991 and further to around 37,00,000 vehicles by 1st January 2004 in Delhi. The sector-wise emission of pollutants in Delhi can be seen from the Table..."
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