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 25 Apr 2023: Wan Chai 22.1 µg/m³, Mong Kok 20.4 µg/m³ and Kwai Chung 16.1 µg/m³.
- 1Wan ChaiWan Chai22.1
- 2Mong KokYau Tsim Mong District20.4
- 3Kwai ChungKwai Tsing District16.1
- 4Tsuen WanTsuen Wan15.9
- 5Tai PoTai Po14.9
- 6Sau Mau PingKwun Tong District14.7
- 7Sha TinSha Tin11.8
Not counted on this day, too few days measured: Sham Shui Po since 25 Apr 2023 and San Tung Chung Hang since 25 Apr 2023. 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.