Alessandria vs Guidonia Montecelio: PM2.5 compared

Alessandria and Guidonia Montecelio were both measured on only 0 days over the last year, too few to compare them (it takes 30).

Right now

Alessandria#48on the 24-hour board of 2,366, at 97 US AQI (34.0 µg/m³)

Guidonia Montecelio–not on the 24-hour board right now

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).

Side by side with Marco Simone (the nearest), Gujranwala (the world's worst on 30 days).

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.