SmogRank / Alessandria / Biella
Alessandria vs Biella: PM2.5 compared
Over the last year, Alessandria's air was 37% more polluted than Biella's: PM2.5 averaged 14.0 µg/m³ against 10.2, on the 94 days both cities were measured. Alessandria had the dirtier air on 77 of those days, Biella on 17. Alessandria was over the WHO's daily guideline of 15 µg/m³ on 30 of them, Biella on 11.
Right now
The last year, day by day
Month by month
Year by year
| Year | Alessandria | Biella | Days Alessandria was worse |
|---|---|---|---|
| 2026 so far | 59 | 53 | 74 |
| 2025 | 58 | 46 | 61 |
Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.
Each city's worst days
Alessandria
- 23 Jan 202612344.5 µg/m³
- 21 Jan 202611340.4 µg/m³
- 14 Oct 20259331.7 µg/m³
Biella
- 13 Aug 20267622.4 µg/m³
- 23 Jan 20267421.6 µg/m³
- 12 Aug 20267320.8 µg/m³
Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.
Compare either city with another
Alessandria
Side by side with Sannazzaro de' Burgondi (the nearest), Vinovo (Italy's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Biella
Side by side with Borgomanero (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Alessandria and Biella, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/it-alessandria/it-biella (accessed 7 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.
Updated 2026-10-07 13:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.