Pune is amongst the fastest growing cities in the county. . During 1991-2001, its population increased by 50.08 percent, compared to a 40 percent growth in the previous decade. Pune uniquely remains a hub for students from all across the globe, and the growth centre of the IT sector. The growth pressure has left the city strained and exhausted. The traffic situation is the worst hit. Air quality is at risk. Studies show high contribution of vehicles to air pollution.