Police stations across the Indian city of Calcutta have been equipped with oxygen devices to enable police to offset the effects of pollution.
The move follows a recent report which said that some 70% of people in the city suffer from respiratory disorders.
The worst offenders are around 50,000 auto rickshaws - half of them unregistered - who use "kantatel".
This is a fuel made out of a deadly concoction of kerosene and petrol.
