Mecca vs Royal Oak: PM2.5 compared
Over the last year, Mecca's air was about 1.8× as polluted as Royal Oak's: PM2.5 averaged 10.8 µg/m³ against 6.0, on the 58 days both cities were measured. Mecca had the dirtier air on 40 of those days, Royal Oak on 18. Mecca was over the WHO's daily guideline of 15 µg/m³ on 11 of them, Royal Oak on 3.
Right now
The last year, day by day
Month by month
Each city's worst days
Mecca
- 21 May 202614854.6 µg/m³
- 16 May 202613047.2 µg/m³
- 18 May 20269733.8 µg/m³
Royal Oak
- 17 May 20268426.8 µg/m³
- 2 Sept 20267321.0 µg/m³
- 18 May 20266918.7 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).
Royal Oak
Side by side with Southfield (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Mecca and Royal Oak, 10 Oct 2025 – 9 Oct 2026, smogrank.com/compare/us-mecca/us-royal-oak (accessed 10 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 2026-10-10 10:07 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); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).