<P> 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 sixth-most populated metropolis in the world (second largest if the entire NCR is included), is one of the most heavily polluted cities in India, having for instance one of the country's highest volumes of particulate matter pollution . In May 2014 the World Health Organization announced New Delhi as the most polluted city in the world . </P> <P> 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, 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. Another known cause of pollution is slow moving traffic due to pedestrians crossing the road just about anywhere . Noise pollution comes mainly from motorcycle and automobile traffic . 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 . </P> <P> The river Yamuna, the reason for Delhi's existence, has suffered heavily from pollution . At its point of entry into Delhi, at Wazirabad, its dissolved oxygen (DO) content is 7.5 milligrammes per litre . At its point of exit from city limits, the DO level is only 1.3 mg / l . Similarly, coliform counts jump from 8,500 per 100 ml at entry to 329,312 / 100ml at exit (for DO 5 mg / litre is the norm and for coliforms 500 / 100ml). In 2007, roughly half of all the city's raw sewage went straight into the river . 55% of the city's 15 million people are connected to the city's sewer system and its treatment plants, but because of corrosion and clogging in the system many of the treatment plants do not run at full capacity . Waste from 1,500 unplanned neighborhoods runs straight into the river . </P>

Where is the pollution in delhi coming from
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