Only nine of Delhi's 37 air quality monitoring stations were functioning on Diwali – when the city was smothered by toxic smog of chemicals from 'green' firecrackers, dust and vehicular pollution, and hazardous particulate matter from farm fires – the Supreme Court was told on Monday.

"Out of 37 in Delhi, only nine monitoring stations were functioning during Diwali…There needs to be a report from CAQM on the current air pollution status,” senior advocate Aparajita Singh --who is assisting the top court as amicus curiae in the Delhi air pollution matter – told a Bench led by CJI BR Gavai.

"There are newspapers after newspapers saying monitoring stations are non-functional. If the monitoring stations are not even functioning, we don't even know when to implement GRAP (Graded Response Actio

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