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Diwali, the Hindu Festival of Lights, is underway and following last year’s ban on fireworks in Delhi, residents are only allowed to use environmentally-friendly ones during a two-hour window. Many complain that little is done to tackle the burning of crop stubble and car fumes which cause most of the smog over the city. Doctors are warning that anyone with respiratory problems should stay indoors. The ÃÛÑ¿´«Ã½â€™s Devina Gupta has assessed how much difference tech companies could make to the amount of polluted air people are exposed to. (Image: A sweeper cleans a road amid heavy smog in New Delhi, Credit: Getty Images.)