Delhi breathes 'very poor' air as Bhalswa landfill in New Delhi fire rages on. Credit: Vikas ChoudharyThis fire has been raging at the dump site since October 20. Credit: Vikas ChoudharyThe polluted air coming from landfill fires is getting trapped owing to low wind speed and temperature. Credit: Vikas ChoudharySahibe Alam, 12, goes to school in the evening and works in the dumpyard during the day to earn Rs 100-200 to help his mother to run the household. Alam says the smoke makes it extremely difficult to work here. Credit: Vikas ChoudharySmoke billows from the landfill, which generates highly combustible methane. Credit: Vikas ChoudharyAccording to the World Health Organization, India has this year become home to the world's 14 most polluted cities, with Delhi ranked sixth. Credit: Vikas Choudhary