Mecca vs Santa Rosa: PM2.5 compared

Mecca and Santa Rosa were both measured on only 3 days over the last year, too few to compare them (it takes 30).

Right now

Mecca#87on the 24-hour board of 2,002, at 77 US AQI (23.1 µg/m³)

Santa Rosa–not on the 24-hour board right now

Side by side with Indio (the nearest), Hanford (United States's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).

Side by side with Sebastopol (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 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.