Weighed down by extremely high levels of particles in the air, some Indian cities seem to be coming of age with regard to vehicular air pollution. Taking the cue from Delhi, where the drive to clean the air is spearheaded by the Supreme Court at the behest of the civil society, people are waking up to take a stand against the slow murder belching out of vehicle tailpipes. In most cases, it is voluntary agencies that are leading the fight in association with lawyers and physicians to find local solutions to the problem. A spate of public interest litigation in high courts have mounted pressure on the state governments to address air pollution problems. But many cities are still doing nothing about it. To assess how serious is the urban Indian getting about air quality, Down To Earth profiles four cities: Mumbai, Calcutta, Bangalore, Hyderabad