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 Dec 2023: Wan Chai 29.2 µg/m³, Tuen Mun 27.9 µg/m³ and Mong Kok 22.8 µg/m³.
- 1Wan ChaiWan Chai29.2
- 2Tuen MunTuen Mun27.9
- 3Mong KokYau Tsim Mong District22.8
- 4Tin Shui WaiYuen Long22.5
- 5Tai PoTai Po22.2
- 6VictoriaCentral and Western20.7
- 7Tsuen WanTsuen Wan20.3
- 8Sham Shui PoSham Shui Po District20.3
- 9Kwai ChungKwai Tsing District20.3
- 10FanlingNorth District20.2
- 11Sau Mau PingKwun Tong District19.9
- 12Sha TinSha Tin19.2
- 13San Tung Chung HangIslands16.3
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.