India, Dec. 22 -- The easier question, said 50-year-old Ronak Prasad, is "What problems does the pollution not cause? Prasad, who has been working as a book vendor in New Friends Colony for 33 years, said he has developed a permanent cough and cold because of the increase in pollution. "The situation gets so bad that I don't have the heart to continue working. My head feels heavy, my eyes burn, and it becomes hard to breathe. I wear a mask when the pollution rises, but have to remove that after sometime too, as I need to speak to the customers." He even falls sick more often costing him his daily wage. "When I fall sick, I do nothing but stay at home so that I can return to work as soon as possible. Since October this year, I have already f...