the state of Haryana, as well as Bharatpur in the state of Rajasthan. This brought the number of districts in the NCR to 19 (outside Delhi NCT), with the total NCR area increasing 34% to 45,887 km2. Subsequently, Charkhi Dadri district was separated from Bhiwani district in 2016. On 9 June 2015, the Government of India approved the inclusion of three more districts in NCR – Jind, Panipat, Karnal in the state of Haryana and Muzaffarnagar in Uttar Pradesh. covering a total area of 50,566 km2. Shamli district of U.P. was added to the NCR in December 2017. As of 2021, there are a total of 24 districts in the NCR, excluding the 11 districts of Delhi. Proposed extensions On 9 January 2018, the government of Uttar Pradesh formally proposed the extension of the NCR to cover the districts Aligarh, Bijnor, Hathras and Mathura. Proposed reductions Under the "Draft Regional Plan 2041", it has been proposed to limit the NCR region to 100-km radius from Rajghat in Delhi for more focused and sustainable development of the region. Government of Haryana has requested NCRPB for at least one-third reduction of its share in the NCR region. Component districts A total of 24 districts in three neighbouring states of Haryana, Uttar Pradesh and Rajasthan along with whole of the National Capital Territory of Delhi constitute the National Capital Region (NCR) of India. The areas and populations (per 2011 census, prior to the addition of Muzaffarnagar, Jind, Karnal and Shamli) of these component districts are set out below: Regional planning The planning body for the region is the National Capital Region Planning Board (NCRPB). It has issued two regional plans, the "Regional Plan 2001, National Capital Region" approved in 1988, and the "Regional Plan 2021, National Capital Region" approved in 2005. Topics covered by the 2001 plan included transport, telecommunications, power and water supply, waste and sewerage, education, health, the environment, housing and the "counter magnet" areas. The 2021 plan extended these with the additional topics of social infrastructure, heritage, tourism, rural development, and disaster management. The 51% of pollution in NCR is caused by the industrial pollution, 27% by vehicles and 8% by crop burning, consequently there are plans to create a 1,600 km long and 5 km wide The Great Green Wall of Aravalli green ecological corridor along Aravalli range from Gujarat to Delhi to be connected to Sivalik hill range