Air pollution levels rose across several parts of Chennai following Deepavali celebrations on November 8, 2026, with four monitored locations recording Air Quality Index (AQI) levels above 300, placing them in the very poor category.
According to data attributed to the Tamil Nadu Pollution Control Board (TNPCB), Valasaravakkam recorded the highest AQI at 343. Nungambakkam followed at 332, while Sowcarpet recorded 311 and T. Nagar registered 306.
Editorial Insight
Key Highlights
Important points readers should notice.
Issue/Event: Post-Deepavali air and noise pollution increased across several monitored locations in Tamil Nadu.
Location: India.
Authority/Organisation: Tamil Nadu Pollution Control Board (TNPCB).
Action Taken: Air-quality and noise monitoring was conducted across the state following Deepavali celebrations.
Impact: Four Chennai locations recorded AQI above 300, while 25 of 39 state monitoring locations reported higher AQI than in 2025.
The readings were part of the pollution monitoring exercise conducted around the Deepavali period. They indicate a significant deterioration at these locations, although they should not be interpreted as live AQI readings for every part of Chennai on November 10.
The wider state-level data also showed an increase in pollution compared with the previous year. Tamil Nadu's average AQI across 39 monitoring locations reached 168.97 in 2026, compared with 161.69 in 2025 and 143.46 in 2024. This represents an increase of approximately 4.5 per cent over 2025.
Of the 39 locations monitored across the state, 25 recorded higher AQI levels than the previous year, while 14 showed improvements. The findings suggest that pollution conditions worsened in several areas, although the trend was not uniform across Tamil Nadu.
Editorial Analysis
Why This Matters
Air pollution is a public-health concern, particularly in densely populated cities where large numbers of people are exposed to vehicle emissions, industrial pollution and seasonal pollution spikes. The Chennai readings are important because four monitored locations entered the very poor AQI category. Prolonged exposure at these levels can increase respiratory discomfort and health risks. The rise in noise levels also highlights another environmental consequence of festival celebrations. Excessive noise can disturb sleep, increase stress and affect people who are particularly sensitive to loud sounds. The state-level comparison provides policymakers with information that can help improve pollution-control planning, public awareness and enforcement of environmental regulations.
The impact was also visible in noise pollution measurements. The state's average Deepavali noise level increased from 75.70 dB(A) in 2025 to 76.73 dB(A) in 2026. Within Chennai, Valasaravakkam recorded a peak noise level of 88.6 dB(A), while Thiruvottiyur registered 77.4 dB(A) during the monitored period.
The TNPCB attributed the rise in air and noise pollution to firecracker emissions and changing meteorological conditions, including wind speed, wind direction and atmospheric stability. These conditions can influence how pollutants disperse and remain concentrated in urban areas.
The figures have renewed attention on the environmental impact of festival celebrations, particularly in densely populated residential and commercial neighbourhoods. Fine particulate pollution is a concern because prolonged exposure can affect respiratory health, especially among children, older people and individuals with existing lung or heart conditions.
For residents, the data underlines the importance of following firecracker regulations and reducing exposure during periods of elevated pollution. Authorities will also need to continue monitoring air quality and strengthening public awareness and enforcement measures.
The latest survey provides a comparative picture of Deepavali-related pollution across Tamil Nadu. Further monitoring will be important to establish how quickly air quality returns to normal levels and whether additional measures are required ahead of future festival seasons.
