Experts warn that a new government definition of the Aravali Hills, accepted by the Supreme Court, could lead to environmental degradation and expose Delhi and surrounding regions to harsher weather and drought conditions.
In December 2016, the Supreme Court directed the central government to have a graded action plan to tackle the menace of air pollution. There are two plans - Comprehensive Action Plan and Graded Response Action Plan.
Air toxics emissions are high from older vehicles.
Centre for Science and Environment said that Delhi has lost the air quality gains of odd and even scheme.