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Siam demands independent study on Delhi air pollution

Ajay Modi  |  New Delhi 

Claiming vehicles contribute only partly to the poor air quality in Delhi, the (Siam) has demanded a comprehensive and into the causes.

The demand from comes in the wake of the National Green Tribunal’s order banning over 10-year-old diesel vehicles from plying in Delhi and the National Capital Region. The ban has been stayed till July 13.

“The various official and non-official studies conducted over the years have shown widely varying results that were inconclusive and did not help in policy decisions,” said Vikram S Kirloskar, president, and vice-chairman of There is no doubt that vehicles add to pollution as they burn fossil fuel, but their contribution has reduced over the past decade due to higher emission norms, he added.

The (CPCB) Source Apportionment Study of 2011 found the transport sector contributes less than seven per cent of total particulate matter (PM10) in Delhi. Studies and papers prepared by Indian Institute of Technology, jointly by international institutes like University of Birmingham, Central Road Research Institute and the Desert Research Institute of US, quantified the contribution of road traffic to PM2.5 emission in Delhi at 18.7 per cent in summers and 16.2 per cent in winters, said.

Studies in Delhi have also found that on holidays and weekends, when significantly lesser numbers of vehicles ply on roads, there has been no significant difference to the level of PM2.5. Claiming vehicle density in Delhi (number of vehicles per kilometre of road) is much lower to Chennai, Mumbai and Hyderabad. Kirloskar said the low PM2.5 in these cities does not establish that vehicles are the major source of pollution.

He also argued that if vehicular emission was the main culprit, the adoption of Bharat Stage (BS) emission BS-IV norms from a non-BS era a decade ago and use of compressed natural gas should have improved the quality of air.

Kirloskar said the argument that the benefits of higher emission norms have been lost due to an increase in the number of vehicles is also not credible since India produces only 2.5 million cars a year, while Europe makes nine million. Siam has argued that while people have a right to clean air they also have a right to mobility. “We cannot sacrifice one for the other. The stakes are too high.”

First Published: Mon, June 01 2015. 00:46 IST