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 Shivalik hill range with the planting of 1.35 billion (135 crore) new native trees over 10 years. About 46% of the National Capital Region, home to 40 to 50 million people, is not connected to sewage networks. Sewage from these areas flows into stormwater drains that empty directly into the Yamuna.