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 21 Nov 2023: Wan Chai 24.0 µg/m³, Tuen Mun 20.5 µg/m³ and Tin Shui Wai 18.7 µg/m³.
- 1Wan ChaiWan Chai24.0
- 2Tuen MunTuen Mun20.5
- 3Tin Shui WaiYuen Long18.7
- 4Mong KokYau Tsim Mong District17.5
- 5FanlingNorth District16.5
- 6Tai PoTai Po16.1
- 7Kwai ChungKwai Tsing District15.8
- 8Sau Mau PingKwun Tong District15.4
- 9San Tung Chung HangIslands15.4
- 10Sham Shui PoSham Shui Po District15.2
- 11Tsuen WanTsuen Wan15.1
- 12Sha TinSha Tin13.9
- 13VictoriaCentral and Western13.1
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.