As Delhi choked on the intervening night of October 20-21, the raw data recorded by monitoring stations painted a picture of an air quality apocalypse: 959 at a station near the Supreme Court of India; 892 at Ashok Vihar; a crippling 998.8 in Chandni Chowk. But, even as 22 of 39 stations crossed the severe plus category of air pollution by 10.45 pm, the official tracking system began to buckle.
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