Los Angeles vs Pasadena: PM2.5 compared

Los Angeles and Pasadena were both measured on only 4 days over the last year, too few to compare them (it takes 30).

Right now

Los Angeles#446on the 24-hour board of 2,753, at 58 US AQI (12.6 µg/m³)

Pasadena#2,322on the 24-hour board of 2,753, at 17 US AQI (3.0 µg/m³)

Compare either city with another

Los Angeles

Side by side with Mecca (United States's worst on 30 days), Gujranwala (the world's worst on 30 days).

Pasadena

Side by side with La Crescenta-Montrose (the nearest), Mecca (United States's worst on 30 days), 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 2026-10-09 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).