SmogRank / History / City race
Cities in Brazil, 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 in Brazil for PM2.5 over the 30 days to 1 May 2023: Timóteo 15.8 µg/m³, Coronel Fabriciano 14.4 µg/m³ and Rio Claro 12.7 µg/m³.
- 1TimóteoMinas Gerais15.8
- 2Coronel FabricianoMinas Gerais14.4
- 3Rio ClaroSão Paulo12.7
- 4LimeiraSão Paulo12.1
- 5AraucáriaParaná11.6
- 6São PauloSão Paulo11.4
- 7CampinasSão Paulo11.4
- 8Nova UniãoMinas Gerais11.3
- 9ItaquaquecetubaSão Paulo11.1
- 10Ferraz de VasconcelosSão Paulo10.7
- 11CongonhasMinas Gerais10.7
- 12Ribeirão PretoSão Paulo10.6
- 13Santo AndréSão Paulo10.4
- 14Belo HorizonteMinas Gerais10.2
- 15IpatingaMinas Gerais10.1
- 16GuaratinguetáSão Paulo9.7
- 17JundiaíSão Paulo9.6
- 18SantosSão Paulo9.5
- 19PiracicabaSão Paulo9.5
- 20AçailândiaMaranhão9.3
+ 12 more cities, the next at 9.1 µg/m³
Not counted on this day, too few days measured: São Félix do Xingu since 28 Apr 2023 and Dias d'Ávila since 7 Apr 2023. Days missing from the source archive fall in this window, so fewer countries are counted.
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.