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 23 Jan 2024: Tuen Mun 34.4 µg/m³, Wan Chai 33.8 µg/m³ and Tin Shui Wai 28.7 µg/m³.
- 1Tuen MunTuen Mun34.4
- 2Wan ChaiWan Chai33.8
- 3Tin Shui WaiYuen Long28.7
- 4Mong KokYau Tsim Mong District27.6
- 5VictoriaCentral and Western26.6
- 6Tsuen WanTsuen Wan26.1
- 7Sham Shui PoSham Shui Po District24.6
- 8Sau Mau PingKwun Tong District24.5
- 9Kwai ChungKwai Tsing District23.9
- 10Tai PoTai Po23.6
- 11San Tung Chung HangIslands22.7
- 12Sha TinSha Tin22.4
- 13FanlingNorth District19.3
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.