SmogRank / World / Brazil / Bahia / February 2023

Most unhealthy days in Bahia, Brazil, February 2023

1 city in Bahia, Brazil ranked by its share of unhealthy days over the 28 days. The most unhealthy days: Dias d'Ávila, Brazil, 0 of 27 measured days. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 25 of these 28 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; many cities elsewhere are missing from this board, not clean. Why.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Cities with the same share are ordered by more unhealthy days, then by the higher average.

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 Bahia, Brazil by unhealthy days (PM2.5), February 2023: each city's share of its measured days with a daily mean over 35.4 µg/m³, cities measured on 20 or more of the 28 days. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/br/region/bahia/history/2023-02?by=days (accessed 12 Oct 2026).

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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.