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 17 Jan 2025: Tuen Mun 42.2 µg/m³, Wan Chai 40.8 µg/m³ and Tin Shui Wai 37.2 µg/m³.
- 1Tuen MunTuen Mun42.2
- 2Wan ChaiWan Chai40.8
- 3Tin Shui WaiYuen Long37.2
- 4San Tung Chung HangIslands37.0
- 5Tai PoTai Po34.1
- 6Mong KokYau Tsim Mong District33.3
- 7FanlingNorth District32.7
- 8Kwai ChungKwai Tsing District32.5
- 9Tsuen WanTsuen Wan32.0
- 10VictoriaCentral and Western31.1
- 11Sham Shui PoSham Shui Po District31.0
- 12Sau Mau PingKwun Tong District30.0
- 13Sha TinSha Tin29.8
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.