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 17 Aug 2024: Wan Chai 17.7 µg/m³, Tuen Mun 11.2 µg/m³ and Tin Shui Wai 10.2 µg/m³.
- 1Wan ChaiWan Chai17.7
- 2Tuen MunTuen Mun11.2
- 3Tin Shui WaiYuen Long10.2
- 4Kwai ChungKwai Tsing District10.2
- 5FanlingNorth District10.2
- 6Mong KokYau Tsim Mong District10.1
- 7Tsuen WanTsuen Wan9.6
- 8San Tung Chung HangIslands9.5
- 9Sham Shui PoSham Shui Po District9.0
- 10Sau Mau PingKwun Tong District9.0
- 11Tai PoTai Po8.6
- 12VictoriaCentral and Western7.1
- 13Sha TinSha Tin6.9
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.