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 13 Feb 2025: Tuen Mun 26.4 µg/m³, Wan Chai 24.8 µg/m³ and Mong Kok 21.1 µg/m³.
- 1Tuen MunTuen Mun26.4
- 2Wan ChaiWan Chai24.8
- 3Mong KokYau Tsim Mong District21.1
- 4San Tung Chung HangIslands20.8
- 5Tin Shui WaiYuen Long20.1
- 6Kwai ChungKwai Tsing District19.8
- 7Tsuen WanTsuen Wan19.3
- 8Tai PoTai Po19.2
- 9FanlingNorth District18.4
- 10Sham Shui PoSham Shui Po District18.0
- 11Sau Mau PingKwun Tong District17.1
- 12VictoriaCentral and Western16.7
- 13Sha TinSha Tin16.5
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.