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 11 Oct 2025: Wan Chai 16.8 µg/m³, Fanling 10.0 µg/m³ and Tin Shui Wai 9.2 µg/m³.
- 1Wan ChaiWan Chai16.8
- 2FanlingNorth District10.0
- 3Tin Shui WaiYuen Long9.2
- 4Mong KokYau Tsim Mong District9.0
- 5Tuen MunTuen Mun8.9
- 6Sham Shui PoSham Shui Po District8.3
- 7Tai PoTai Po8.1
- 8Kwai ChungKwai Tsing District8.0
- 9Sau Mau PingKwun Tong District7.6
- 10Tsuen WanTsuen Wan7.4
- 11San Tung Chung HangIslands7.3
- 12Sha TinSha Tin6.4
- 13VictoriaCentral and Western6.3
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.