New Delhi: Even as the national capital continued its battle with toxic air, several instances of firecracker bursting, before and after the time limit fixed by the apex court, were observed in Delhi-NCR during New Year celebrations.

The Centre-run System of Air Quality and Weather Forecasting (SAFAR) on Monday warned that any new trigger, particularly due to “open fire and pyrotechnic display (firecrackers)”, will make the air heavier and thicker which may lead to rapid deterioration in air quality to severe-plus range.

The Central Pollution Control Board (CPCB) had written to Delhi police and district magistrates of the national capital, Noida and Gurgaon ahead of Christmas and New Year’s eve to ensure that the Supreme court order in this regard is followed and no firecrackers are burst.

But despite the warnings, several instances of violations of the apex court order was observed, officials said, adding the number of violations committed was, however, not available immediately.

The Supreme Court had come down heavily on the revellers of Diwali, whom it had allowed a window of two hours to burst firecrackers. On Christmas and the New Year’s Eve, the apex court allowed bursting of green firecrackers between 11.55 PM and 12.30 AM, since these celebrations start midnight.