CSE claimed vehicles contribute smaller particles that get into blood stream and damage respiratory and cardiovascular systems causing cancer and premature deaths and there is evidence that pollution levels in Delhi go down when cars are off the road.
"We are deeply shocked at the callous and indifferent attitude of the ministry towards one of the most serious public health crises looming in Delhi and other cities of India," said Sunita Narain, director general, CSE.
"The ministry has contended that vehicles are not to be blamed for the pollution as they account for only 6.6 per cent of the particulate problem and that pollution in the air is mostly due to dust from roads and construction activities, not vehicles, the CSE claimed.
"The government seems desperate to belittle the role of vehicles. This protects automobile industry and car users because combating pollution today requires tough measures to restrain cars, encourage public transport and leapfrog vehicle technology," said Anumita Roychowdhury, CSE executive director and head of its air pollution control programme.
CSE said that the claims of the Ministry is based on "flawed study" which ignores the more deadly PM 2.5 concentrations.
"The Ministry seems to be holding the health of the public, especially children and the old, to ransom by this action," it said.