SmogRank / History / Country race
Countries, worst air first, day by day
Each country's typical measured city over the 30 days to every day since January 2023, worst first. Press Play to watch the order change, or drag the slider to any day.
The worst countries for PM2.5 over the 7 days to 19 Jun 2023: Chile 51.4 µg/m³, Pakistan 39.0 µg/m³ and India 29.1 µg/m³.
- 1Chile44 cities51.4
- 2Pakistan4 cities39.0
- 3India5 cities29.1
- 4China3 cities24.1
- 5Mexico11 cities18.5
- 6Lithuania4 cities13.2
- 7Belgium41 cities11.8
- 8Malta4 cities11.7
- 9Luxembourg3 cities11.4
- 10United Kingdom44 cities, was 511.3
- 11Thailand11 cities11.1
- 12Czechia36 cities11.0
- 13Serbia3 cities11.0
- 14Ireland4 cities10.7
- 15Germany192 cities10.6
- 16Switzerland9 cities10.4
- 17Slovakia26 cities10.4
- 18France128 cities10.2
- 19Greece8 cities10.2
- 20Italy30 cities10.2
+ 12 more countries, 9.5 µg/m³ and below
- 26United States742 cities8.7
Not counted on this day, too few cities measured: Hong Kong since 15 Jun 2023, Martinique since 15 Jun 2023, The Netherlands since 15 Jun 2023 and 7 more countries.
Countries counted each day
A country's number is its typical measured city: the median of its cities' means over the 30 days (a city needs 21 of them measured; 5 of 7 on the 7-day race), shown only with 3 such cities. A country whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air; "was" beside a city count marks a month after many cities joined or left. 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.