Mecca vs Union Gap: PM2.5 compared
Over the last year, Mecca's air was about 2.5× as polluted as Union Gap's: PM2.5 averaged 12.9 µg/m³ against 5.1, on the 34 days both cities were measured. Mecca had the dirtier air on 27 of those days, Union Gap on 7. Mecca was over the WHO's daily guideline of 15 µg/m³ on 15 of them, Union Gap on 0.
Right now
The last year, day by day
Month by month
Each city's worst days
Mecca
- 1 Oct 20268225.9 µg/m³
- 6 Oct 20267622.5 µg/m³
- 23 Sept 20267421.2 µg/m³
Union Gap
- 19 Sept 20265410.7 µg/m³
- 20 Sept 20265310.2 µg/m³
- 12 Sept 2026529.7 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
Mecca
Side by side with Indio (the nearest), Hanford (United States's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Union Gap
Side by side with Yakima (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Mecca and Union Gap, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/us-mecca/us-union-gap (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 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.