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 24 Jun 2024: Coyhaique 121.0 µg/m³, Santa María 108.2 µg/m³ and N'Djamena 76.6 µg/m³.
- 1CoyhaiqueChile121.0
- 2Santa MaríaPeru108.2
- 3N'DjamenaChad76.6
- 4OsornoChile75.5
- 5DelhiIndia66.8
- 6NacimientoChile65.2
- 7Santa Anita - Los FicusPeru64.2
- 8RengoChile58.0
- 9HualpénChile58.0
- 10CuricóChile57.7
- 11CuranilahueChile51.7
- 12Puerto VarasChile51.4
- 13La UniónChile49.9
- 14San CarlosChile49.2
- 15DhakaBangladesh49.1
- 16RancaguaChile48.7
- 17PeshawarPakistan48.3
- 18BaghdadIraq47.9
- 19TalaganteChile47.9
- 20Puerto AysénChile47.6
+ 2,685 more cities, the next at 47.5 µg/m³
Not counted on this day, too few days measured: Quilpué since 22 Jun 2024, Laja since 13 Jun 2024, Lahore since 7 Jun 2024 and Tlaquepaque since 23 May 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, 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.