SmogRank / World / Australia / 2025
Most polluted cities in Australia, 2025
2 cities in Australia ranked by their average PM2.5 over the 365 days; 1 above the WHO annual guideline (5.0 µg/m³). Worst: Sydney at 5.3 µg/m³, #2,185 of 2,320 cities in the world. Cleanest: Melbourne at 4.6. A city needs measurements on 70% of the days to be ranked.
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, 2025 · Australia now
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SmogRank, most polluted cities in Australia, PM2.5, 2025, smogrank.com/au/history/2025 (accessed 2 Oct 2026).
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