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.
The move follows a recent report which said that some 70% of people in the city suffer from respiratory disorders.
It said that traffic police were among the worst hit by poor air quality.
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Only 10% of Calcutta's 1.5m vehicles have converted to green fuels - and only 20% of those have taken an emission test in the last two years.
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more:
http://news.bbc.co.uk/2/hi/south_asia/6665803.stmCalcutta has tough vehicle emissions laws (tougher than US!) but they have not been enforced -- see the article for details.