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 15 Feb 2025: India 84.8 µg/m³, Pakistan 77.4 µg/m³ and Bosnia and Herzegovina 65.2 µg/m³.
- 1India5 cities84.8
- 2Pakistan4 cities77.4
- 3Bosnia and Herzegovina4 cities65.2
- 4Serbia37 cities41.1
- 5Slovenia12 cities41.0
- 6China3 cities40.0
- 7Thailand83 cities, was 1637.7
- 8Poland75 cities34.1
- 9The Netherlands24 cities32.6
- 10Belgium45 cities31.6
- 11Romania10 cities30.7
- 12Czechia35 cities, was 3729.9
- 13Germany253 cities29.4
- 14Bulgaria5 cities25.4
- 15Laos3 cities25.2
- 16Slovakia40 cities24.9
- 17Hungary11 cities24.8
- 18United Kingdom4 cities24.1
- 19Lithuania3 cities22.3
- 20Mexico14 cities21.8
+ 25 more countries, 21.3 µg/m³ and below
- 37United States831 cities7.1
Not counted on this day, too few cities measured: Martinique since 15 Feb 2025, Luxembourg since 21 Jan 2025 and Singapore since 9 Jan 2025.
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.