This is all fine and well, but someone is not paying attention to reality. The buses and auto-rickshaws here spit out black gunk like crazy, and those things run all hours. I would be amazed if any one rickshaw in Bangalore could pass an emissions test. If a Whitefield bus backed up to the testing center, the attendant would die of asphyxiation! I doubt that motorcycle and car engines are the source of the majority of the air pollution.