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 15 Jan 2026: Nilópolis 14.4 µg/m³, Ferraz de Vasconcelos 11.8 µg/m³ and Jundiaí 11.5 µg/m³.
- 1NilópolisRio de Janeiro14.4
- 2Ferraz de VasconcelosSão Paulo11.8
- 3JundiaíSão Paulo11.5
- 4SantosSão Paulo10.5
- 5São PauloSão Paulo10.2
- 6CubatãoSão Paulo9.9
- 7CampinasSão Paulo9.6
- 8Duque de CaxiasRio de Janeiro9.5
- 9ItaquaquecetubaSão Paulo9.1
- 10PaulíniaSão Paulo8.8
- 11Rio ClaroSão Paulo8.7
- 12TaubatéSão Paulo8.3
- 13São José dos CamposSão Paulo8.1
- 14AcariRio de Janeiro8.0
- 15LimeiraSão Paulo7.8
- 16Rio de JaneiroRio de Janeiro7.6
- 17Presidente PrudenteSão Paulo7.2
- 18São José do Rio PretoSão Paulo6.9
- 19Ribeirão PretoSão Paulo6.8
- 20Barra da TijucaRio de Janeiro6.5
Not counted on this day, too few days measured: Guarapuava since 10 Jan 2026, Guarapari since 10 Jan 2026, Francisco Beltrão since 10 Jan 2026 and 28 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.