"These (oil companies) have a lot of money. And these are also the ones causing pollution. Theirs is a big contribution for pollution in the country," Gadkari said at an event organised by the Mumbai Port Trust here.
He asked the hydrocarbon companies to contribute to environment protection, citing the case of Indian Oil Corporation which has set up a sewage treatment plant near the Yamuna.
He regretted that domestic car makers were unable to make cleaner Euro-VI compliant engines, but made it clear that April 2020 deadline will not be changed.
"Pollution is the biggest problem of our country," said Gadkari, who handles the shipping and road transport portfolios.
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"We are reading about Delhi in newspapers. For Mumbai, it is my prayer before the chief minister and officials... The real problem (in Mumbai) is water and air," Gadkari said.
He said two major ports in the city and its periphery -- Mumbai and JNPT -- are setting up sewage treatment plants and added that the water can be used for oil refineries.
Gadkari, who has lived in Mumbai for long, also said he does not feel like going to the Worli Seaface promenade these days because of the stench.
Meanwhile, in a bid to promote water transport,
Gadkari today announced that his ministry has sanctioned building of passenger jetties at nine locations in the state, including Borivali, Gorai, Vasai, Bhayander, Virar, Manori, Ghodbunder and Malwan.
He said the Maharashtra government's original proposal was for developing the infrastructure at 69 places and promised that the remaining 69 will also be positively considered.
Gadkari also mooted the idea of installing a marina in the north-west suburb of Bandra, which can handle passenger movements.
The minister also appealed to Bombay High Court Chief Justice for an early hearing into a case where MbPT (Mumbai Port Trust) wants to take over the Radio Club, saying it has not come up for hearing in the last six years.
The minister said a note on land use policy in major ports that will clear the decks for redevelopment in MbPT has been moved to the Cabinet and exuded confidence that it will tabled during the Winter Session of Parliament starting November 16.
Gadkari laid the foundation stone for the Rs 811-crore fifth oil berth at Jawahar Dweep at MbPT, which will add 22 MTPC capacity by accommodating larger vessels.