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Most polluted cities in Paraná, Brazil, 2025

7 cities in Paraná, Brazil ranked by their average PM2.5 over the 365 days; 7 above the WHO annual guideline (5.0 µg/m³). Worst: Colombo at 15.3 µg/m³, #395 of 2,659 cities in the world. Cleanest: Ponta Grossa at 9.2. A city needs measurements on 70% of the days to be ranked.

← Colombo 15.3 µg/m³ 10 µg/m³5 WHO annual guideline0
Every city in Paraná, Brazil ranked for 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Colombo
    633.1×
  2. 2Guarapuava
    582.6×
  3. 3Araucária
    572.4×
  4. 4Maringá
    532.1×
  5. 5Paranaguá
    532.0×
  6. 6Curitiba
    522.0×
  7. 7Ponta Grossa
    511.8×
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

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SmogRank, most polluted cities in Paraná, Brazil by mean PM2.5 (µg/m³), 2025: each city's mean of its daily means, cities measured on 256 or more of the 365 days. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/br/region/parana/history/2025 (accessed 11 Oct 2026). Some readings from Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.