SmogRank / World / Australia / October 2025
Most polluted cities in Australia, October 2025
2 cities in Australia ranked by their average PM2.5 over the 31 days. Worst: Sydney at 3.9 µg/m³, #2,150 of 2,296 cities in the world. Cleanest: Melbourne at 1.1. A city needs measurements on 70% of the days to be ranked.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. 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, October 2025 · Australia now
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SmogRank, most polluted cities in Australia, PM2.5, October 2025, smogrank.com/au/history/2025-10 (accessed 2 Oct 2026).
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