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 12 Apr 2026: Wan Chai 22.7 µg/m³, Tuen Mun 18.2 µg/m³ and Sham Shui Po 17.1 µg/m³.
- 1Wan ChaiWan Chai22.7
- 2Tuen MunTuen Mun18.2
- 3Sham Shui PoSham Shui Po District17.1
- 4Kwai ChungKwai Tsing District16.4
- 5Sau Mau PingKwun Tong District16.2
- 6FanlingNorth District16.2
- 7VictoriaCentral and Western15.3
- 8Tai PoTai Po15.2
- 9Tin Shui WaiYuen Long14.5
- 10San Tung Chung HangIslands14.3
- 11Tsuen WanTsuen Wan14.1
- 12Sha TinSha Tin13.7
- 13Mong KokYau Tsim Mong District13.6
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.