The judiciary, be it the Supreme Court, the Delhi High Court, which once described that residing in the national capital was akin to "living in a gas chamber", or the National Green Tribunal (NGT), dealt with these issues with an iron hand and passed a slew of stern directions.
Giving a strong message that judiciary would leave no stone unturned to curb the problem, the apex court on December 16 banned the registration of new diesel-run SUVs, high-end private cars with engine capacity of 2000CC and above in Delhi NCR till March 31, 2016.
The ban on registration of new diesel-run vehicles was the brainchild of NGT which had observed that the situation was so alarming that people have been even advised to leave Delhi due to adverse effects on health.
The pollution issue hogged the limelight during the year and the high court too joined the chorus when it said air pollution is of an "emergency nature" and this situation would not have arisen had the authorities implemented laws and rules to prevent environmental degradation.
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The AAP government's odd-even numbers scheme came a day after the high court remarked that the current air pollution levels in the national capital have reached "alarming" level.
The scheme, which allows plying of private vehicles on alternate days from January 1, 2016, was virtually endorsed by Chief Justice of India T S Thakur who said it can be followed "if it helps in reducing" the problem.
The worsening air pollution was a much talked-about issue in the courts' corridors as during the hearing in one of these matters, then Chief Justice of India H L Dattu remarked, "My grandson wears mask due to pollution and looks like a Ninja."
The Supreme Court led from the front on these issues by passing a slew of directions on various pleas, including a PIL filed in 1984, and imposed Environment Compensation Charge (ECC) ranging from Rs 1,400 to Rs 2,600 on commercial vehicles entering Delhi on trial basis.
The warning bells rang in the high court when a report filed by the Centre for Science and Environment (CSE) said that the main lobby of the court had more than 2.5 times the particulate matter as compared to the safety standard.
The high court castigated its own panel concerned, the Maintenance and Construction Committee, for not doing anything on the issue saying it was "unacceptable" that everyone going to the lobby were at risk.
It said the cumulative effect of such highly-polluted air in Delhi-NCR "was very harmful to the public health".
As a significant interim measure, the green panel on December 11 ordered that no diesel-run vehicles should be registered in Delhi and there shall not be any renewal of registration of vehicles which are more than 10 years old.
The NGT, which asked the departments of central and state governments not to purchase any diesel vehicles in future, had on April 7 held that all diesel vehicles which are more than 10-year-old would not be permitted to ply in Delhi-NCR areas.
The green panel said that there are three main sources of air pollution in the NCR of Delhi -- dust, emissions resulting from burning and industrial pollution and finally vehicular emissions.
It said that the garbage and burning of other materials form nearly 29.4 per cent of the air pollution with reference to PM10 in Delhi-NCR.