Delhi with its gardens and green spaces, with its high levels of income and with its ever increasing avenues for employment attracts nearly 5 lakh persons by way of in-migration every year. Environmental problems in Delhi, India, are a threat to the well-being of the city's and area's inhabitants as well as the flora and fauna. Delhi, the eighth-most populated metropolis in the world, is one of th
e most heavily polluted cities in India,[1] having for instance one of the country's highest volumes of particulate matter pollution.[2]
Overpopulation and the ensuing overuse of scarce resources such as water put heavy pressure on the environment. The city suffers from air pollution caused by road dust and industry,[3] with comparatively smaller contributions from unclean engines in transportation, especially diesel-powered city buses and trucks, and 2-wheelers and 3-wheelers with two-stroke engines.[4] Noise pollution comes mainly from motorcycle and automobile traffic.[5] Water pollution and a lack of solid waste treatment facilities have caused serious damage to the river on whose banks Delhi grew, the Yamuna. Besides human and environmental damage, pollution has caused economic damage as well; Delhi may have lost the competition to host the 2014 Asian Games because of its poor environment
