India, Dec. 22 -- Mahesh Kumar, who hails from Uttar Pradesh's Baghpat district, said he doesn't understand the difference between fog and pollution, but the constant itching in his nose and eyes had definitely not been an issue for him in winters till he came to Delhi. "I am from a village and I don't understand the science of pollution. But every morning, at around 4, I leave my home in Baghpat to catch a train for New Delhi because I work the early shift from 6 to 2 in the afternoon. As soon as I reach the New Delhi Railway Station, just behind the Chandni Chowk market, I see thick grey coloured fog but it doesn't feel that cold," said Kumar. "I don't know how to explain... in my village the fog isn't this heavily layered but it's really...