SmogRank / Countries / Brazil / Rio de Janeiro

Most polluted cities in Rio de Janeiro, Brazil

6 measured cities, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Nilópolis at 10.2 µg/m³, #419 in the world.

5 good  1 moderate

  1. 1Nilópolis 10.20.7×
  2. 2Itaguaí 7.20.5×
  3. 3Barra da Tijuca 6.70.4×
  4. 4Duque de Caxias 6.00.4×
  5. 5Acari 5.90.4×
  6. 6Rio de Janeiro 5.80.4×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Estimated: cities without a monitor

Rio de Janeiro cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Nova Iguaçu≈ 9 µg/m³Moderate
Belford Roxo≈ 9 µg/m³Moderate
Niterói≈ 9 µg/m³Moderate
Campos dos Goytacazes≈ 7 µg/m³Good
São João de Meriti≈ 9 µg/m³Moderate
Petrópolis≈ 6 µg/m³Good
São Gonçalo≈ 9 µg/m³Moderate
Volta Redonda≈ 8 µg/m³Good
Macaé≈ 5 µg/m³Good
Magé≈ 9 µg/m³Moderate
Itaboraí≈ 5 µg/m³Good
Cabo Frio≈ 5 µg/m³Good
Maricá≈ 5 µg/m³Good
Nova Friburgo≈ 3 µg/m³Good
Barra Mansa≈ 8 µg/m³Good
Angra dos Reis≈ 6 µg/m³Good
Teresópolis≈ 3 µg/m³Good
Rio das Ostras≈ 5 µg/m³Good
Queimados≈ 9 µg/m³Moderate
Araruama≈ 4 µg/m³Good
Resende≈ 6 µg/m³Good
São Pedro da Aldeia≈ 5 µg/m³Good
Itaperuna≈ 4 µg/m³Good
Japeri≈ 9 µg/m³Moderate
Barra do Piraí≈ 8 µg/m³Good
Saquarema≈ 4 µg/m³Good
Seropédica≈ 9 µg/m³Moderate
Botafogo≈ 9 µg/m³Moderate
Três Rios≈ 4 µg/m³Good
Valença≈ 8 µg/m³Good
Cachoeiras de Macacu≈ 3 µg/m³Good
Rio Bonito≈ 5 µg/m³Good
Guapimirim≈ 3 µg/m³Good
São Francisco de Itabapoana≈ 4 µg/m³Good
Casimiro de Abreu≈ 3 µg/m³Good
Mangaratiba≈ 8 µg/m³Good
Cordovil≈ 9 µg/m³Moderate
Paraíba do Sul≈ 4 µg/m³Good
Santo Antônio de Pádua≈ 4 µg/m³Good
Paracambi≈ 9 µg/m³Moderate

Updated 2026-10-01 21:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.