Outside the usual range10 September 2026Environment
Uttar Pradesh: highest city air quality index over the 7 days to 10 September 2026 was 179, above the 5-year median of 125 for the same week (+43%).
What happened
- 7-day mean to 10 September 2026
- 179
- That day alone: 277
- 5-year median, same week
- 125
- Change
- +54
- Change, per cent
- +43%
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 highest city air quality index, lower is better. This movement is therefore assessed as a deterioration.
Historical context
Same week in earlier years: 2025 112, 2024 125, 2023 129, 2022 151, 2021 103. Daily values are compared as 7-day means because a single day mostly reflects weather.
Full history of highest city air quality index in Uttar Pradesh
The underlying data
| Period | Value | Release | Where in the document |
|---|---|---|---|
| 10 September 2026 | 277 | CPCB National Air Quality Index bulletin, 10 September 2026 (243 cities) | AQI bulletin p.1–13, Index Value column: highest of 24 city rows placed in Uttar Pradesh — Bulandshahr, S.No 53 (p.3), Poor |
| 9 September 2026 | 241 | CPCB National Air Quality Index bulletin, 9 September 2026 (252 cities) | AQI bulletin p.1–13, Index Value column: highest of 27 city rows placed in Uttar Pradesh — Bulandshahr, S.No 55 (p.3), Poor |
| 8 September 2026 | 222 | CPCB National Air Quality Index bulletin, 8 September 2026 (254 cities) | AQI bulletin p.1–13, Index Value column: highest of 26 city rows placed in Uttar Pradesh — Greater noida, S.No 97 (p.5), Poor |
| 7 September 2026 | 154 | CPCB National Air Quality Index bulletin, 7 September 2026 (237 cities) | AQI bulletin p.1–12, Index Value column: highest of 24 city rows placed in Uttar Pradesh — Khora, S.No 129 (p.7), Moderate |
| 6 September 2026 | 171 | CPCB National Air Quality Index bulletin, 6 September 2026 (250 cities) | AQI bulletin p.1–13, Index Value column: highest of 26 city rows placed in Uttar Pradesh — Gorakhpur, S.No 92 (p.5), Moderate |
| 5 September 2026 |
Source and method
- Release
- CPCB National Air Quality Index bulletin, 10 September 2026 (243 cities)Archived fileOriginal URLFirst seen 3 Oct 2026
More signals for highest city air quality index in Uttar Pradesh
Cite this
According to the India Health Observatory, Uttar Pradesh: highest city air quality index over the 7 days to 10 September 2026 was 179, above the 5-year median of 125 for the same week (+43%). Source: Central Pollution Control Board, Ministry of Environment, Forest and Climate Change, CPCB National Air Quality Index bulletin, 10 September 2026 (243 cities). https://indiahealthobservatory.com/signals/worst-city-aqi--uttar-pradesh--2026-09-10--baseline_breach
See also Uttar Pradesh and 277 AQI in context.