It is a big crackdown that has been unleashed by the National Green Tribunal (NGT) on Friday to give relief to the public which has been breathing toxic air for weeks and the chances of it getting worse are increasing. NGT has directed that only CNG buses or cabs will be allowed to ply at Delhi airport. The special tribunal has also directed all Non-CNG buses or coaches or other vehicles plying at the airport, should be converted to CNG within six months from today. The green panel has also given 6 months to DIAL and other agencies to ensure that all coaches and buses at Delhi Airport are CNG. Earlier in the month, the tribunal has been taking various steps at curbing the pollution in the national capital. On November 14, the NGT had expressed concern over the high pollution level, terming it as an "environmental and health emergency". The city should "not gift infected lungs to its children", it had observed. On November 9, the Tribunal also issued a slew of directions to deal with the worsening air quality in Delhi and neighbouring states, banning construction and industrial activities and entry of trucks, as it lambasted the Delhi government and civic bodies over the situation. A bench headed by NGT Chairperson Justice Swatanter Kumar was quoted by PTI as saying that no construction activity will be carried out on structures until further orders. The bench also added that all industrial activities in Delhi-NCR which are causing emissions will also not be allowed to carry on their functioning. An irked green panel had also imposed a ban on the entry of diesel trucks more than ten years old and said that no vehicle from outside or within Delhi will be permitted to transport any construction material. It had also refused to exempt women and two-wheelers from the Delhi government's odd-even vehicle rationing scheme and directed it to ensure that over 10-year-old diesel vehicles be taken off the roads without delay. It had also asked the city government to identify the most polluted areas and sprinkle water while allowing the non-polluting industries and those manufacturing essential goods to operate in Delhi-NCR. Recently, a plea highlighting environmental pollution caused by the improper waste disposal and unregulated use of antibiotics in poultry farms prompted the NGT to seek a response from the Centre and others. A bench headed by NGT Chairperson Justice Swatanter Kumar issued notices to the Ministry of Environment and Forests Food Safety and Standards Authority of India, Central Drugs Standard Control Organisation and Central Pollution Control Board (CPCB) and sought their reply in three weeks. The matter was listed for hearing on January 9, 2018.