Acerra vs Milan: PM2.5 compared
Over the last year, Acerra's air was 15% more polluted than Milan's: PM2.5 averaged 14.4 µg/m³ against 12.5, on the 112 days both cities were measured. Acerra had the dirtier air on 78 of those days, Milan on 34. Acerra was over the WHO's daily guideline of 15 µg/m³ on 45 of them, Milan on 26.
Right now
The last year, day by day
Month by month
Year by year
| Year | Acerra | Milan | Days Acerra was worse |
|---|---|---|---|
| 2026 so far | 61 | 57 | 77 |
| 2025 | 56 | 55 | 66 |
| 2024 | 71 | 68 | 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
Acerra
Milan
Daily means in US AQI, 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, Gujranwala.
Milan
Side by side with Monza, Vinovo, Gujranwala.
Use this page
SmogRank, PM2.5 daily means compared, Acerra and Milan, 21 Oct 2025 – 4 Oct 2026, smogrank.com/compare/it-acerra/it-milan (accessed 6 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 2026-10-06 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.