SmogRank / Alessandria / San Pietro Vernotico
Alessandria vs San Pietro Vernotico: PM2.5 compared
Over the last year, San Pietro Vernotico's air was about 2.0× as polluted as Alessandria's: PM2.5 averaged 26.4 µg/m³ against 13.1, on the 48 days both cities were measured. San Pietro Vernotico had the dirtier air on 15 of those days, Alessandria on 33. San Pietro Vernotico was over the WHO's daily guideline of 15 µg/m³ on 8 of them, Alessandria on 15.
Right now
The last year, day by day
Month by month
Year by year
| Year | Alessandria | San Pietro Vernotico | Days Alessandria was worse |
|---|---|---|---|
| 2026 so far | 57 | 57 | 31 |
| 2025 | 55 | 64 | 75 |
| 2024 | 74 | 56 | 77 |
| 2023 | 70 | 60 | 128 |
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
- 14 Oct 20259331.7 µg/m³
- 12 Apr 20267923.9 µg/m³
- 11 Apr 20267723.3 µg/m³
San Pietro Vernotico
- 21 Oct 2025500+699.0 µg/m³
- 12 Apr 202617894.7 µg/m³
- 26 Apr 202615460.1 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).
San Pietro Vernotico
Side by side with Torchiarolo (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Alessandria and San Pietro Vernotico, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/it-alessandria/it-san-pietro-vernotico (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.