SmogRank / World / South America / Brazil / Rio Grande do Sul

Most polluted cities in Rio Grande do Sul, Brazil

No city in Rio Grande do Sul, Brazil has enough readings to rank for the last 24 hours.

A city joins the 24-hour ranking with 18 hours of readings in the last 24; none here has that right now, so there is nothing to map or chart.

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Rio Grande do Sul 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.

City	7-day estimate	Band
Porto Alegre	≈ 12 µg/m³	Moderate
Caxias do Sul	≈ 9 µg/m³	Good
Pelotas	≈ 6 µg/m³	Good
Canoas	≈ 12 µg/m³	Moderate
Santa Maria	≈ 8 µg/m³	Good
Gravataí	≈ 10 µg/m³	Moderate
Novo Hamburgo	≈ 13 µg/m³	Moderate
Viamão	≈ 12 µg/m³	Moderate
Passo Fundo	≈ 12 µg/m³	Moderate
São Leopoldo	≈ 13 µg/m³	Moderate
Rio Grande	≈ 9 µg/m³	Good
Alvorada	≈ 12 µg/m³	Moderate
Cachoeirinha	≈ 12 µg/m³	Moderate
Santa Cruz do Sul	≈ 10 µg/m³	Moderate
Sapucaia do Sul	≈ 12 µg/m³	Moderate
Bento Gonçalves	≈ 12 µg/m³	Moderate
Bagé	≈ 5 µg/m³	Good
Uruguaiana	≈ 6 µg/m³	Good
Guaíba	≈ 12 µg/m³	Moderate
Erechim	≈ 16 µg/m³	Moderate
Lajeado	≈ 12 µg/m³	Moderate
Ijuí	≈ 11 µg/m³	Moderate
Cachoeira do Sul	≈ 8 µg/m³	Good
Santo Ângelo	≈ 10 µg/m³	Moderate
Santa Rosa	≈ 10 µg/m³	Moderate
Sant'Ana do Livramento	≈ 5 µg/m³	Good
Esteio	≈ 12 µg/m³	Moderate
Sapiranga	≈ 13 µg/m³	Moderate
Alegrete	≈ 6 µg/m³	Good
Farroupilha	≈ 9 µg/m³	Good
Venâncio Aires	≈ 12 µg/m³	Moderate
Camaquã	≈ 6 µg/m³	Good
Montenegro	≈ 14 µg/m³	Moderate
Vacaria	≈ 7 µg/m³	Good
Capão da Canoa	≈ 10 µg/m³	Moderate
Campo Bom	≈ 13 µg/m³	Moderate
Carazinho	≈ 12 µg/m³	Moderate
São Borja	≈ 7 µg/m³	Good
Cruz Alta	≈ 11 µg/m³	Moderate
São Gabriel	≈ 6 µg/m³	Good

Updated 2026-10-02 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.