SmogRank / Acerra / Alessandria
Acerra vs Alessandria: PM2.5 compared
Over the last year, Acerra's air was 24% more polluted than Alessandria's: PM2.5 averaged 16.1 µg/m³ against 13.0, on the 97 days both cities were measured. Acerra had the dirtier air on 73 of those days, Alessandria on 23. Acerra was over the WHO's daily guideline of 15 µg/m³ on 51 of them, Alessandria on 25.
Right now
The last year, day by day
Month by month
Year by year
| Year | Acerra | Alessandria | Days Acerra was worse |
|---|---|---|---|
| 2026 so far | 64 | 58 | 73 |
| 2025 | 58 | 55 | 46 |
| 2024 | 69 | 67 | 41 |
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
Acerra
- 23 Jan 202613850.7 µg/m³
- 29 Aug 202611340.2 µg/m³
- 28 Aug 20269733.9 µg/m³
Alessandria
- 23 Jan 202612344.5 µg/m³
- 21 Jan 202611340.4 µg/m³
- 6 Oct 20268527.6 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
Acerra
Side by side with Marigliano (the nearest), Gujranwala (the world's worst on 30 days).
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).
Use this page
SmogRank, PM2.5 daily means compared, Acerra and Alessandria, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/it-acerra/it-alessandria (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.