Open problems · Environment & pollution
Winter air pollution
Delhi's air turns hazardous every winter, and has done so for more than a decade.
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DiscussionOpen for ideas, evidence and questions.
What we know
Winter air pollution has returned every year for more than a decade. Emergency curbs under the Graded Response Action Plan (GRAP) are imposed every October to January.
Open questions
- Which sources contribute most to Delhi's winter pollution, and how do the estimates differ?
- How much has been spent on air-pollution control, and what did each measure change?
- What brought down winter pollution in other large cities?
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