SmogRank / World / Brazil / Paraná / December 2025

Most polluted cities in Paraná, Brazil, December 2025

10 cities in Paraná, Brazil ranked by their average PM2.5 over the 31 days. Worst: Colombo at 15.1 µg/m³, #725 of 2,987 cities in the world. Cleanest: União da Vitória at 6.6. A city needs measurements on 70% of the days to be ranked.

← Colombo 15.1 µg/m³ 20 µg/m³0

Every city in Paraná, Brazil ranked for December 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.

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

All cities in the world, December 2025 · All cities in Brazil, December 2025 · Paraná now

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SmogRank, most polluted cities in Paraná, Brazil by mean PM2.5 (µg/m³), December 2025: each city's mean of its daily means, cities measured on 22 or more of the 31 days. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/br/region/parana/history/2025-12 (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.