I just found this link http://www.science20.com/news_articles/solving_ozone_problem... . I am sure this will be a problem for many years but it will be addressed. The problem on the other hand is the pollutants from automobiles. If someone is driving a car in New Delhi with windows down for few hours, can feel the grease from engine fumes on face and nostrils. Clean your nose and that is when you realize how terrible the traffic is. The problem is not with people who are driving the cars. There are pedestrians and people living off streets who breath that air all day. It scares me to see a child breath that air as I am tend to fall sick with throat ruptured even after a day on the road inside a car. That would hopefully change around the world if we have electric vehicles.