A policy to conserve water resources led to the rise of a major source of air pollution, making breathing Delhi’s air as bad as smoking 50 cigarettes.

More than 20 million residents in Delhi’s metropolitan area are yet again facing some of the worst pollution on earth, with air quality degrading to dangerous levels this week as a mix of weather conditions, urban emissions, and rural smoke converge over India’s capital region.

Delhi’s Chief Minister Arvind Kejriwal turned to Twitter to describe his city as a “gas chamber.”

NOMAD [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons

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