SmogRank / Alessandria / Aosta
Alessandria vs Aosta: PM2.5 compared
Over the last year, Alessandria's air was 40% more polluted than Aosta's: PM2.5 averaged 13.4 µg/m³ against 9.6, on the 107 days both cities were measured. Alessandria had the dirtier air on 89 of those days, Aosta on 16. Alessandria was over the WHO's daily guideline of 15 µg/m³ on 30 of them, Aosta on 18.
Right now
The last year, day by day
Month by month
Year by year
| Year | Alessandria | Aosta | Days Alessandria was worse |
|---|---|---|---|
| 2026 so far | 58 | 52 | 86 |
| 2025 | 56 | 41 | 87 |
| 2024 | 66 | 39 | 78 |
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
Aosta
- 26 Sept 202611541.0 µg/m³
- 2 Oct 20268426.8 µg/m³
- 23 Jan 20267622.3 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).
Aosta
Side by side with Passy (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Alessandria and Aosta, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/it-alessandria/it-aosta (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.