Stay indoors, take inhalers out: With Delhi's abysmal pollution record - it is the fourth most polluted city in the world, with 2,000 tonnes of pollutants spewed into its air every day, according to S.M. Sarin, acting director, central Road Research Institute - there is reason enough to worry. A World Health Organisation study has found significant correlation between highlevels of sulphur dioxide, a major constituent of diesel fumes, and the prevalence of dyspinea (breathing difficulty) and chronic cough.