The quality of the air is gauged by PM (Particulate matter, a complex mixture of extremely small particles of organic chemicals, metals, and soil or dust). Normal breathable air is considered between 0-50 PM.

Statistically, PM is categorised in six levels-  

0-50- Good    
51-100-   Moderate
101-150-  Unhealthy for Sensitive Groups
151 to 200-    Unhealthy
201 to 300-    Very Unhealthy
301 to 500-    Hazardous

365 PM on July 16, in Delhi (Anand Vihar)

Consequently, this data indicates at alarming picture of pollution level in Delhi where residents are living in hazardous environment. In London, if PM level touches 50, it raises alarm there but in Delhi, pollution is less talked issue. Burdening by rapidly increasing number of vehicles, Delhi is at verge of ditch. It has been proved that air of the national capital is harmful for the human lungs.  

Recently in June, the NGT has prohibited all diesel vehicles over 10 years old from plying on roads to reduce PM level in the city. Also, NGT took some measures to clean Yamuna. It has accepted recommendations of an expert committee headed by IIT professor AK Gosain. One of the plans is to ensure that no sewage enters the natural storm water drains. In another bid to control  air pollution in Delhi, NG T  has banned burning of waste in the open air. The tribunal  made provision of a fine of Rs 5,000 in Delhi.

Kejriwal-led government has also taken some strict measures. In the latest move, the government has hiked fee levied on vehicles and fine on owners for violating traffic rules.    

In spite of having tag of the most polluted city in the world, Delhi has the largest forest cover (180 sq kms) in comparison to three metropolitan cities in the country.

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