Adapting to the national policy and creating a unique market are functions of time and communication, said Vishwajit Dahanukar, managing director of Managing Emissions, a clean-energy-project developer, adviser and asset manager.
Sam Leonard, the director of vehicular emissions policy at General Motors, said oxygenates may be of some benefit when a car is first started up, but that their importance for carbon monoxide reduction is declining as cars with carburetors are replaced by cars with fuel injection.
More than 1,000 brick kilns that cater to Delhi's construction boom burn away within 20km (12 miles) of the city during the dry winter spell, according to Dr Sarath Guttikunda, director of Urban Emissions Info.
Dr Sarath Guttikunda, director of Delhi-based Urban Emissions Info, refused to be drawn into this number game.
"The inherent advantages of natural gas have diminished in the past three or four years as superclean gasoline and diesels have come on the market because of tighter emissions regulations," said Tom Cackette, chief deputy executive director of the California Air Resources Board, which regulates emissions in the state.
"Any addition to the exposure levels we're already experiencing in New York is something that should be avoided to the extent possible, given what we know about the toxicity and potential health effects of diesel emissions," Dr. Frederica P. Perera, director of the Columbia Center for Children's Environmental Health at Columbia University, said in an interview.
DD is a professor of the Radiology and Radiological Sciences Department and the director of the Nuclear Medicine and Positron Emission Tomography.
"The E.P.A. still is not doing enough to cut auto and power plant emissions," said Daniel F. Becker, director of the Sierra Club's global warming program.
John Sterman, director of the MIT Sloan Sustainability Initiative, said the new emissions projection study, which he wasn't involved in, was "sound" in its conclusions.
Airlines and airports need to be more vocal about improvements that the industry has made in reducing noise and carbon dioxide emissions, said Laurie Price, director of aviation strategy for Mott MacDonald, an international consulting company.
