Chennai stood out for its severe pollution surge during Deepavali - The Hindu

Many Indian cities, including Chennai, Hyderabad, and Ahmedabad, recorded their highest PM10 levels of the year around Deepavali, but Chennai stood out for two reasons. First, unlike some other cities that experience consistently high pollution levels, Chennai's PM10 concentrations spiked only around Deepavali. Second, the city's peak PM10 level around Deepavali was the second highest in the country.The chart below shows hourly PM10 levels recorded between January 1 and October 22, 2025, across select cities.Both the darker red shades and larger circles represent higher PM10 levels.