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 19 Feb 2024: Wan Chai 26.9 µg/m³, Tuen Mun 26.1 µg/m³ and San Tung Chung Hang 22.9 µg/m³.
- 1Wan ChaiWan Chai26.9
- 2Tuen MunTuen Mun26.1
- 3San Tung Chung HangIslands22.9
- 4Mong KokYau Tsim Mong District20.9
- 5Tin Shui WaiYuen Long20.7
- 6VictoriaCentral and Western19.1
- 7Tsuen WanTsuen Wan18.9
- 8Tai PoTai Po18.4
- 9Sau Mau PingKwun Tong District18.3
- 10Sham Shui PoSham Shui Po District18.2
- 11Sha TinSha Tin17.3
- 12FanlingNorth District15.4
- 13Kwai ChungKwai Tsing District14.6
Days missing from the source archive fall in this window, so fewer countries are counted.
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.