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 14 May 2025: Wan Chai 25.5 µg/m³, Tuen Mun 19.7 µg/m³ and Mong Kok 18.3 µg/m³.
- 1Wan ChaiWan Chai25.5
- 2Tuen MunTuen Mun19.7
- 3Mong KokYau Tsim Mong District18.3
- 4FanlingNorth District17.8
- 5Kwai ChungKwai Tsing District17.0
- 6Tai PoTai Po16.7
- 7Tin Shui WaiYuen Long16.5
- 8San Tung Chung HangIslands16.5
- 9Sham Shui PoSham Shui Po District16.2
- 10Tsuen WanTsuen Wan15.8
- 11Sau Mau PingKwun Tong District15.8
- 12VictoriaCentral and Western15.1
- 13Sha TinSha Tin13.2
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.