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 May 2025: Wan Chai 23.3 µg/m³, Tuen Mun 16.7 µg/m³ and Mong Kok 15.6 µg/m³.
- 1Wan ChaiWan Chai23.3
- 2Tuen MunTuen Mun16.7
- 3Mong KokYau Tsim Mong District15.6
- 4FanlingNorth District15.0
- 5Kwai ChungKwai Tsing District14.8
- 6Tin Shui WaiYuen Long14.6
- 7Tai PoTai Po14.4
- 8Sham Shui PoSham Shui Po District14.4
- 9Sau Mau PingKwun Tong District13.8
- 10Tsuen WanTsuen Wan13.7
- 11San Tung Chung HangIslands13.6
- 12VictoriaCentral and Western12.5
- 13Sha TinSha Tin11.5
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.