New Delhi: This Diwali surged to dangerous highs in the national capital, with PM2.5 concentrations averaging 488 µg/m3 post the festival of lights.

An analysis compiled by Climate Trends based on the data of the Central Pollution Control Board (CPCB) from 2021-2025 showed that Delhi’s air pollution levels on Diwali surged to dangerous highs, with PM2.5 concentrations averaging 488 µg/m3 post-Diwali.

Over the five-year analysis, data showed a consistent Diwali-related pollution spike with PM2.5 values typically doubling or tripling during the festival of night and persisting through the next day.

Firecracker emissions remain the dominant cause of Delhi’s short-term air quality collapse during the festive period. What is particulate matter? Airborne particulate matter (PM) is not a sing

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