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 Apr 2025: Wan Chai 29.6 µg/m³, Tuen Mun 27.9 µg/m³ and San Tung Chung Hang 25.1 µg/m³.
- 1Wan ChaiWan Chai29.6
- 2Tuen MunTuen Mun27.9
- 3San Tung Chung HangIslands25.1
- 4Mong KokYau Tsim Mong District24.6
- 5FanlingNorth District24.2
- 6Tai PoTai Po23.0
- 7Tin Shui WaiYuen Long22.3
- 8Kwai ChungKwai Tsing District21.8
- 9Tsuen WanTsuen Wan21.5
- 10VictoriaCentral and Western21.5
- 11Sham Shui PoSham Shui Po District20.5
- 12Sau Mau PingKwun Tong District20.1
- 13Sha TinSha Tin19.1
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.