Outside the usual range1 October 2026Environment
Chandigarh: average air quality index over the 7 days to 1 October 2026 was 43, below the 5-year median of 73 for the same week (−41%).
What happened
- 7-day mean to 1 October 2026
- 43
- That day alone: 49
- 5-year median, same week
- 73
- Change
- −30
- Change, per cent
- −41%
Why it matters
Daily figures mostly reflect the weather, so the observatory compares the mean of the last seven days with the same week in up to five earlier years. A breach means this week sits well outside what those years would lead you to expect, and by at least 15%. It is reported when an unusual run begins and for the latest day while it lasts, not every day.
For average air quality index, lower is better. This movement is therefore assessed as an improvement.
Historical context
This is a small-sample figure (e.g. a single monitoring city). Same week in earlier years: 2025 73, 2024 80, 2023 97, 2022 71, 2021 61. Daily values are compared as 7-day means because a single day mostly reflects weather.
The underlying data
| Period | Value | Release | Where in the document |
|---|---|---|---|
| 1 October 2026 | 49 | CPCB National Air Quality Index bulletin, 1 October 2026 (247 cities) | AQI bulletin p.3, Index Value column: mean of 1 city row placed in Chandigarh — Chandigarh (p.3) |
| 30 September 2026 | 46 | CPCB National Air Quality Index bulletin, 30 September 2026 (255 cities) | AQI bulletin p.4, Index Value column: mean of 1 city row placed in Chandigarh — Chandigarh (p.4) |
| 29 September 2026 | 28 | CPCB National Air Quality Index bulletin, 29 September 2026 (252 cities) | AQI bulletin p.4, Index Value column: mean of 1 city row placed in Chandigarh — Chandigarh (p.4) |
| 28 September 2026 | 28 | CPCB National Air Quality Index bulletin, 28 September 2026 (238 cities) | AQI bulletin p.3, Index Value column: mean of 1 city row placed in Chandigarh — Chandigarh (p.3) |
| 27 September 2026 | 37 | CPCB National Air Quality Index bulletin, 27 September 2026 (235 cities) | AQI bulletin p.3, Index Value column: mean of 1 city row placed in Chandigarh — Chandigarh (p.3) |
| 26 September 2026 | 63 |
Source and method
- Release
- CPCB National Air Quality Index bulletin, 1 October 2026 (247 cities)Archived fileOriginal URLFirst seen 3 Oct 2026
More signals for average air quality index in Chandigarh
- Chandigarh: average air quality index over the 7 days to 24 September 2026 was 47, below the 5-year median of 64 for the same week (−26%).
- Chandigarh: average air quality index over the 7 days to 22 September 2026 was 45, below the 5-year median of 62 for the same week (−28%).
- Chandigarh: average air quality index over the 7 days to 19 September 2026 was 45, below the 5-year median of 69 for the same week (−36%).
- Chandigarh: average air quality index over the 7 days to 10 September 2026 was 46, below the 5-year median of 89 for the same week (−48%).
- Chandigarh: average air quality index over the 7 days to 28 August 2026 was 45, below the 5-year median of 63 for the same week (−29%).
Cite this
According to the India Health Observatory, Chandigarh: average air quality index over the 7 days to 1 October 2026 was 43, below the 5-year median of 73 for the same week (−41%). Source: Central Pollution Control Board, Ministry of Environment, Forest and Climate Change, CPCB National Air Quality Index bulletin, 1 October 2026 (247 cities). https://indiahealthobservatory.com/signals/air-quality-index--chandigarh--2026-10-01--baseline_breach
See also Chandigarh and 49 AQI in context.