New Delhi: Despite a significant drop in stubble burning across neighbouring states, Delhi’s air quality nosedived to its worst post-Diwali level in five years on Tuesday. It exposed the ineffectiveness of so-called “green” firecrackers.

According to the data from the Central Pollution Control Board (CPCB), Delhi’s average PM2.5 concentration surged to 488 micrograms per cubic metre on Tuesday morning. It is nearly about 100 times the World Health Organization’s safe exposure limit. The pollution levels marked a 212 per cent spike from pre-Diwali readings. The highest hourly concentration recorded at 675 micrograms per........

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