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The Central Pollution Control Board (CPCB) on 5 January told the Supreme Court that despite the ban on sale of crackers in Delhi-NCR, air quality worsened in the national capital due to fireworks during Diwali in 2017.
A report submitted in the apex court said that as per a study carried out before and after Diwali, specific ill-effects of firecrackers couldn't be substantiated and a long-term study would be required.
The top pollution monitoring body told a bench comprising justices A K Sikri and Ashok Bhushan that in pursuance to the apex court order of 12 September last year, a study titled "Health Impact Assessment of Firecrackers Bursting during Dussehra and Diwali" was carried out.
The top court had last year constituted a committee, to be chaired by the chairperson of the CPCB, to conduct a research on the impact of the fire crackers during the festive season of Dussehra and Diwali on the health of people and submit a report by 31 December.
It said that on Diwali, sulphur dioxide and nitrogen dioxide level remained almost within prescribed limit.
The pollution monitoring body said that although there was some increase in cough and breathlessness, but this did not translate into any significant illness requiring immediate medical attention.
Other system related complaints were also not much different during pre and post Dussehra and Diwali, it said.
The top court had earlier taken the CPCB to task for not conducting any study on the harmful effects of materials used in the manufacture of fire crackers despite its directions, saying it was "really disturbed".
It had termed as "astonishing" that the board has not conducted a study or prepared a report on this aspect and said that government authorities have paid "very little or no attention" to the possible health hazards faced by children due to exposure to such chemicals.
The apex court, in its 9 October order, had said the 11 November, 2016 order suspending licences for sale of fireworks "should be given one chance to test itself" to see whether it had a positive effect, particularly during Diwali.
On 12 September this year, the top court had temporarily lifted its order suspending the permanent licences for sale of fire crackers in NCR, saying a complete ban would be an "extreme step" and a graded approach was needed to curb pollution caused by them.
The court, in its last year's direction, had suspended all licenses which permits sale of fireworks, wholesale and retail within the territory of NCR till further orders.
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