Fewer vehicles than other major cities, but Hyd high on pollution / Toxic 'workplace': For traffic cops, there is no escaping air pollution / Metro trains to go extra mile in fight against pollution in city / Study finds urban office buildings pump out volatile chemicals to the outdoors, comparable to traffic emissions / Main cause of air pollution in cities is traffic / Jakarta named world's most polluted city: Dry season, motorized vehicles play large role in poor air quality