Record30 September 2026Environment
West Bengal: average air quality index of 103 on 30 September 2026 is the highest since 6 March 2026.
What happened
- 30 September 2026
- 103
- 2026-03-06
- 121
Why it matters
A record says how long it has been since the series was this high or this low. It puts a single value in the context of the whole published history.
For average air quality index, lower is better. This movement is therefore assessed as a deterioration.
Historical context
207 consecutive earlier days were lower.
The underlying data
| Period | Value | Release | Where in the document |
|---|---|---|---|
| 30 September 2026 | 103 | CPCB National Air Quality Index bulletin, 30 September 2026 (255 cities) | AQI bulletin p.1–8, Index Value column: mean of 6 city rows placed in West Bengal — Asansol (p.1), Barrackpore (p.2), Durgapur (p.5), Haldia (p.6), Howrah (p.6), Kolkata (p.8) |
| 6 March 2026 | 121 | CPCB National Air Quality Index bulletin, 6 March 2026 (242 cities) | AQI bulletin p.1–11, Index Value column: mean of 7 city rows placed in West Bengal — Asansol (p.1), Barrackpore (p.2), Durgapur (p.5), Haldia (p.5), Howrah (p.5), Kolkata (p.7), Siliguri (p.11) |
Source and method
More signals for average air quality index in West Bengal
- West Bengal: average air quality index over the 7 days to 3 October 2026 was 87, above the 5-year median of 53 for the same week (+63%).
- West Bengal: average air quality index of 106 on 3 October 2026 is the highest since 6 March 2026.
- West Bengal: average air quality index over the 7 days to 1 October 2026 was 69, above the 5-year median of 56 for the same week (+22%).
- West Bengal: average air quality index over the 7 days to 26 September 2026 was 44, below the 5-year median of 59 for the same week (−25%).
- West Bengal: average air quality index of 37 on 25 September 2026 is the lowest since 30 October 2025.
- West Bengal: average air quality index of 38 on 24 September 2026 is the lowest since 30 October 2025.
Cite this
According to the India Health Observatory, West Bengal: average air quality index of 103 on 30 September 2026 is the highest since 6 March 2026. Source: Central Pollution Control Board, Ministry of Environment, Forest and Climate Change, CPCB National Air Quality Index bulletin, 30 September 2026 (255 cities). https://indiahealthobservatory.com/signals/air-quality-index--west-bengal--2026-09-30--record
See also West Bengal and 103 AQI in context.