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 24 Jun 2024: Coyhaique 116.6 µg/m³, Santa María 100.6 µg/m³ and Delhi 69.6 µg/m³.
- 1CoyhaiqueChile116.6
- 2Santa MaríaPeru100.6
- 3DelhiIndia69.6
- 4Santa Anita - Los FicusPeru66.2
- 5OsornoChile58.8
- 6VillarricaChile56.8
- 7NacimientoChile56.6
- 8TalcahuanoChile53.5
- 9N'DjamenaChad53.1
- 10Ash ShīḩānīyahQatar51.0
- 11CuranilahueChile48.3
- 12BeijingChina48.2
- 13BaghdadIraq47.0
- 14San CarlosChile46.3
- 15Puerto AysénChile45.2
- 16La UniónChile43.1
- 17Los ÁngelesChile42.6
- 18Addis AbabaEthiopia41.7
- 19ChillánChile41.7
- 20ValdiviaChile41.3
+ 2,674 more cities, the next at 41.0 µg/m³
Not counted on this day, too few days measured: Shenyang since 24 Jun 2024, Hualpén since 24 Jun 2024, Jakarta since 21 Jun 2024 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, 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.