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 Apr 2025: Wan Chai 27.7 µg/m³, Tuen Mun 26.4 µg/m³ and San Tung Chung Hang 23.2 µg/m³.
- 1Wan ChaiWan Chai27.7
- 2Tuen MunTuen Mun26.4
- 3San Tung Chung HangIslands23.2
- 4Mong KokYau Tsim Mong District22.7
- 5FanlingNorth District22.4
- 6Tai PoTai Po21.9
- 7Tin Shui WaiYuen Long21.8
- 8Tsuen WanTsuen Wan20.6
- 9Kwai ChungKwai Tsing District20.6
- 10VictoriaCentral and Western20.0
- 11Sham Shui PoSham Shui Po District19.6
- 12Sau Mau PingKwun Tong District19.0
- 13Sha TinSha Tin18.1
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.