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 20 May 2025: Aya Nagar 119.5 µg/m³, Narela 103.8 µg/m³ and Muzaffarnagar 100.3 µg/m³.
- 1Aya NagarIndia119.5
- 2NarelaIndia103.8
- 3MuzaffarnagarIndia100.3
- 4BawānaIndia97.6
- 5Dera MāndiIndia90.3
- 6DelhiIndia86.8
- 7NajafgarhIndia80.2
- 8LoniIndia79.5
- 9LucknowIndia78.0
- 10GobindgarhIndia77.6
- 11GhāziābādIndia76.8
- 12NacimientoChile75.5
- 13NagapattinamIndia75.1
- 14DushanbeTajikistan73.1
- 15PatiālaIndia72.4
- 16Santa Anita - Los FicusPeru71.1
- 17HualpénChile70.0
- 18LudhianaIndia69.6
- 19San CarlosChile66.4
- 20JalandharIndia66.0
+ 2,966 more cities, the next at 65.7 µg/m³
Not counted on this day, too few days measured: Ramanathapuram since 20 May 2025, Rājgīr since 20 May 2025, Sasarām since 10 May 2025 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.