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 27 Nov 2023: Lahore 299.3 µg/m³, Delhi 242.4 µg/m³ and Kolkata 161.6 µg/m³.
- 1LahorePakistan299.3
- 2DelhiIndia242.4
- 3KolkataIndia161.6
- 4DhakaBangladesh152.7
- 5KarachiPakistan115.8
- 6IslamabadPakistan94.2
- 7CairoEgypt78.5
- 8SarajevoBosnia and Herzegovina74.0
- 9MumbaiIndia62.4
- 10TlaquepaqueMexico61.7
- 11HyderabadIndia57.7
- 12Samut SakhonThailand52.2
- 13TetovoNorth Macedonia49.6
- 14BeijingChina49.5
- 15GuangzhouChina47.8
- 16Ulan BatorMongolia47.8
- 17AbujaNigeria47.7
- 18JakartaIndonesia45.2
- 19KathmanduNepal42.8
- 20KavadarciNorth Macedonia40.1
+ 2,335 more cities, the next at 38.7 µg/m³
Not counted on this day, too few days measured: N'Djamena since 26 Nov 2023, Peshawar since 25 Nov 2023, Ashgabat since 20 Nov 2023 and 9 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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.