Noida, short for the New Okhla Industrial Development Authority, is a systematically planned Indian city under the management of the New Okhla Industrial Development Authority (also called NOIDA). It is part of National Capital Region of India. Noida came into administrative existence on 17 April 1976 and celebrates 17 April as "Noida Day". It was set up as part of an urbanisation thrust during the controversial Emergency period (1975–1977). The city was created under the UP Industrial Area Development Act, 1976 by the initiatives of Sanjay Gandhi. The city has the highest per capita income in the whole National Capital Region. Noida is classified as a special economic zone (SEZ). The Noida Authority is among the richest civic bodies in the country. As per provisional reports of Census India, the population of Noida in 2011 is 642,381; of which male and female are 352,577 and 289,804 respectively. Roads in Noida are lined by trees and it is considered to be India's greenest city with about 50% green cover, the highest of any city in India.