Short answers, pulled from the story.
New Delhi was inaugurated in ceremonies beginning on the 10th of February 1931, with Viceroy and Governor-General Irwin presiding. The foundation stone had been laid by King George V during the Delhi Durbar of 1911, and construction took approximately twenty years.
New Delhi was designed primarily by British architects Edwin Lutyens and Herbert Baker, both leading figures of twentieth-century British architecture. Lutyens designed the central administrative area, while Baker designed the Parliament House and the Secretariat buildings. The construction contract was awarded to Sobha Singh.
Calcutta had become the centre of India's nationalist movement since the late nineteenth century, leading to political assassinations of British officials and a public boycott of British goods. The colonial government reunited Bengal and simultaneously shifted the capital to Delhi, which was considered a more central and easier location from which to administer India.
The World Health Organization ranked New Delhi as the world's most polluted city in 2014 among about 1,600 cities it tracked. On the 5th of November 2020, PM2.5 concentrations reached 14 times the WHO safe limit. On the 7th of November 2017, the Indian Medical Association declared a public health emergency, with PM2.5 levels measured at 710 micrograms per cubic metre, more than 11 times the WHO threshold.
The Delhi Metro has a total network length of 348.12 km spanning 255 stations across 10 colour-coded lines, making it the world's 12th largest metro system by length. It was built and operated by the Delhi Metro Rail Corporation Limited under the leadership of E. Sreedharan, known as the "Metro Man" of India, who was awarded the Legion of Honour by the French government for his contribution to the project.
New Delhi has hosted the 1951 Asian Games, the 1982 Asian Games, and the 2010 Commonwealth Games. The city also had a bid to host the 1992 Summer Olympics but withdrew in March 1986. India hosted the G20 Summit in New Delhi in 2023.