Clean air is a sign of civilization.
Air Pollution Ranking of 32 Cities
City / Annual PM2.5 Level / Number of unhealthy particle pollution days
- Delhi / 122
- Beijing / 85
- Cairo / 76
- Shanghai / 52
- Yaoudé / 49
- Johannesburg / 41
- Antananarivo / 37
- Hong Kong / 29
- Bangkok / 24
- Seoul / 24
- Moscow / 20
- Mexico City / 20
- Sao Paulo / 19
- Brussels / 18
- Paris / 18
- Rio de Janeiro / 18
- Singapore / 18
- Manila / 17
- Nairobi / 17
- Berlin / 16
- Barcelona / 15
- London / 15
- Munich / 15
- Los Angeles / 11 / 77
- Madrid / 10
- Washington DC / 10
- San Francisco / 9 / 5
- New York / 9 / 0
- Toronto / 8
- Melbourne / 8
- Boston / 7
- Sydney / 6
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