SmogRank / History / City race
Cities in Hong Kong, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Hong Kong for PM2.5 over the 30 days to 9 Apr 2026: Wan Chai 23.1 µg/m³, Tuen Mun 19.4 µg/m³ and Sham Shui Po 18.1 µg/m³.
- 1Wan ChaiWan Chai23.1
- 2Tuen MunTuen Mun19.4
- 3Sham Shui PoSham Shui Po District18.1
- 4Kwai ChungKwai Tsing District17.2
- 5Sau Mau PingKwun Tong District17.0
- 6FanlingNorth District16.8
- 7VictoriaCentral and Western16.3
- 8Tai PoTai Po15.8
- 9San Tung Chung HangIslands15.8
- 10Tin Shui WaiYuen Long15.6
- 11Tsuen WanTsuen Wan15.0
- 12Mong KokYau Tsim Mong District14.8
- 13Sha TinSha Tin14.6
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.