SmogRank / History / City race
Cities, 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 for PM2.5 over the 7 days to 17 Apr 2024: N'Djamena 143.0 µg/m³, Kathmandu 105.9 µg/m³ and Coyhaique 105.8 µg/m³.
- 1N'DjamenaChad143.0
- 2KathmanduNepal105.9
- 3CoyhaiqueChile105.8
- 4DhakaBangladesh100.4
- 5Ubon RatchathaniThailand84.6
- 6BeijingChina73.5
- 7KolkataIndia73.1
- 8KalasinThailand71.5
- 9MukdahanThailand64.4
- 10YasothonThailand61.4
- 11DelhiIndia60.4
- 12Chiang KhongThailand59.8
- 13Ban HouakhouaLaos59.8
- 14Santa MaríaPeru59.0
- 15Amnat CharoenThailand58.2
- 16Tha BoThailand56.0
- 17VientianeLaos56.0
- 18Roi EtThailand52.8
- 19UttaraditThailand51.1
- 20NanThailand48.0
+ 2,654 more cities, 47.6 µg/m³ and below
Not counted on this day, too few days measured: Toluca since 29 Mar 2024 and Tlaquepaque since 2 Mar 2024.
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.