New Delhi has been engulfed by a toxic cloud of pollution after millions of residents defied bans on the use of firecrackers during the Hindu festival of Diwali.
Air pollution early on Friday morning exceeded measurable levels, with the city’s air quality monitors all reading an alarming 999 — beyond which the gauges can no longer distinguish change. A reading higher than 100 is considered unhealthy.
The Lancet medical journal has estimated that air pollution in India causes 1m deaths a year.
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