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 22 Sep 2023: Wan Chai 18.8 µg/m³, San Tung Chung Hang 10.3 µg/m³ and Mong Kok 10.3 µg/m³.
- 1Wan ChaiWan Chai18.8
- 2San Tung Chung HangIslands10.3
- 3Mong KokYau Tsim Mong District10.3
- 4FanlingNorth District9.7
- 5Sham Shui PoSham Shui Po District9.6
- 6Tsuen WanTsuen Wan9.5
- 7Tin Shui WaiYuen Long9.5
- 8Kwai ChungKwai Tsing District9.4
- 9Sau Mau PingKwun Tong District9.0
- 10Tai PoTai Po8.3
- 11Sha TinSha Tin7.6
Not counted on this day, too few days measured: Victoria since 9 Sep 2023 and Tuen Mun since 8 Sep 2023.
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.