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 6 Sep 2026: Wan Chai 20.6 µg/m³, Fanling 12.8 µg/m³ and Mong Kok 12.4 µg/m³.
- 1Wan ChaiWan Chai20.6
- 2FanlingNorth District12.8
- 3Mong KokYau Tsim Mong District12.4
- 4Kwai ChungKwai Tsing District12.3
- 5Sham Shui PoSham Shui Po District11.9
- 6Sau Mau PingKwun Tong District11.7
- 7San Tung Chung HangIslands11.6
- 8Tin Shui WaiYuen Long11.5
- 9Tai PoTai Po11.2
- 10Tsuen WanTsuen Wan10.9
- 11VictoriaCentral and Western10.7
- 12Sha TinSha Tin9.9
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.