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Delhi recorded its first very poor AQI of the season at 324, triggering Stage 2 of the Graded Response Action Plan across Delhi-NCR.
Officials and experts cited unfavourable meteorological conditions, low wind speed and high humidity as contributors to the worsening pollution.
The Delhi Metro announced 20 additional weekday trips from Tuesday to encourage public transport use.
Border checks for vehicle emissions led to severe traffic congestion.
Why it mattersThe season’s first sharp pollution spike can affect health, commute times, and which controls authorities may tighten next.
More context
The Delhi High Court refused to stay restrictions on non-Delhi-registered vehicles, while the Supreme Court allowed certified green firecrackers under specific conditions.