Delhi

Delhi, is a city and a union territory of India containing New Delhi, the capital of India. It is bordered by Haryana (Gurugram, Faridabad, Jhajjar and Sonipat) on three sides and by Uttar Pradesh (Gautam Budh Nagar, Ghaziabad and Baghpat) to the east. The NCT covers an area of 1,484 square kilometres (573 sq mi). According to the 2011 census, Delhi's city proper population was over 11 million, the second-highest in India after Mumbai, while the whole NCT's population was about 16.8 million. Delhi's urban area is now considered to extend beyond the NCT boundaries, and include the neighbouring satellite cities of Ghaziabad, Noida, Greater Noida, Faridabad, Gurgaon, Bahadurgarh and Sonipat in an area now called Central National Capital Region (CNCR) and had an estimated 2016 population of over 26 million people, making it the world's second-largest urban area according to the United Nations. Delhi is the second-wealthiest city in India after Mumbai and is home to 18 billionaires and 23,000 millionaires. Delhi ranks fifth among the Indian states and union territories in human development index.Delhi has the second-highest GDP per capita in India.Furthermore, it is considered one of the world's most polluted city by particulate matter concentration.