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 30 days to 13 Feb 2024: N'Djamena 202.7 µg/m³, Lahore 202.2 µg/m³ and Dhaka 200.0 µg/m³.
- 1N'DjamenaChad202.7
- 2LahorePakistan202.2
- 3DhakaBangladesh200.0
- 4DelhiIndia193.9
- 5PeshawarPakistan187.2
- 6KolkataIndia164.5
- 7Ulan BatorMongolia135.6
- 8AbujaNigeria135.6
- 9IslamabadPakistan126.8
- 10PljevljaMontenegro89.1
- 11KarachiPakistan88.4
- 12SarajevoBosnia and Herzegovina80.8
- 13KathmanduNepal79.8
- 14ShenyangChina79.5
- 15Banja LukaBosnia and Herzegovina76.7
- 16CairoEgypt67.0
- 17MumbaiIndia66.3
- 18TetovoNorth Macedonia62.5
- 19HyderabadIndia60.9
- 20KigaliRwanda57.9
+ 2,454 more cities, 57.6 µg/m³ and below
Not counted on this day, too few days measured: Ciudad Benito Juárez since 25 Jan 2024, Tlaquepaque since 17 Jan 2024, Lagos since 11 Jan 2024 and Victoria de Durango since 10 Jan 2024. 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.