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 Oct 2023: Mong Kok 12.6 µg/m³ and Sau Mau Ping 11.7 µg/m³.
- 1Mong KokYau Tsim Mong District12.6
- 2Sau Mau PingKwun Tong District11.7
Not counted on this day, too few days measured: Sha Tin since 22 Oct 2023, Wan Chai since 21 Oct 2023, Tuen Mun since 21 Oct 2023 and 8 more cities.
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.