Department of Environment 
As per latest Forest Survey of India report 2011, Green cover of Delhi has increased to about 296.20 sq km in 2009 from 26 Sq. Km in 1997. After having achieved unprecedented success in increasing the green cover, efforts have been sustained to plant more and more trees on vacant lands through active involvement of greening agencies and community participation. This also includes free distribution of saplings to schools, RWAs, NGOs and other citizen groups through Forest Department’s nurseries, petrol pumps, CNG Stations, mother dairy booths etc and financial assistance to RWAs for maintenance of parks and gardens.
In 2009, Delhi received INDIRA PRIYADARSHINI VRIKSHA MITRA AWARDS from Ministry of Environment and Forests, Govt. of India for increasing and maintaining the green cover of Delhi.
Today, Delhi has nearly 20000 small/medium/big parks and gardens, 40 city forests, 5 ridge areas, 2 bio-diversity parks and other green belts.
Under City Plants a Million Tree Campaign, 2011 conducted during monsoon,a total of 14.5 lakh saplings have been planted by various departments / agencies / organizations. This year also similar campaign during monsoon will be conducted.
The Forest department is striving to increase the forest and tree cover in Delhi to 310 sq.km by the end of 2012.
Parks and gardens in Delhi are being maintained and developed through Delhi Parks and Garden Society (DPGS), an autonomous body under Department of Environment, which also provide financial assistance to RWAs / NGOs for maintaining parks / gardens. So far, 1267 parks are being maintained by 285 RWAs through Grant-in Aid from DPGS, which amounts to Rs. 4.48 Crores.