| By Subir Bhaumik BBC News, Calcutta |
Police stations across the Indian city of Calcutta have been equipped with oxygen devices to enable police to offset the effects of pollution. The extra air is for the benefit of hundreds of traffic policemen in the city who have to brave some of the worst pollution in the world. 
Few vehicles are tested for pollution emissions
The move follows a recent report which said that some 70% of people in the city suffer from respiratory disorders.
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