Air quality in Choi Wan estimated
Wong Tai Sin District, Hong Kong. No ground monitor we can use is in this city, so these numbers are model estimates, not measurements.
≈ 10 µg/m³
Moderate
Estimated PM2.5, 7-day average to 2026-09-30, about 0.6× the WHO 24-hour guideline. 30-day average ≈ 11 µg/m³.
Model estimate from the Copernicus Atmosphere Monitoring Service (CAMS), scaled by 0.51 to match 10 measured cities within 300 km over the last week. Adjusted this way, a single day lands within ×1.5 of what a monitor would read about two times in three: a guide, not a measurement. Not ranked on SmogRank's boards.
Last 30 days, estimated
Daily means, UTC days. Dashed line: WHO 24-hour guideline (15 µg/m³).
Measured cities nearby
| City | Distance | 7-day average |
|---|---|---|
| Sau Mau Ping | 3 km | 12.0 µg/m³ |
| Mong Kok | 5 km | 11.6 µg/m³ |
| Sham Shui Po | 6 km | 11.7 µg/m³ |
| Sha Tin | 6 km | 9.1 µg/m³ |
| Wan Chai | 7 km | 18.3 µg/m³ |
| Kwai Chung | 9 km | 12.3 µg/m³ |
Estimates contain modified Copernicus Atmosphere Monitoring Service information 2026. How estimates are made.