Major Cities by Best Air Quality in the World

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1.
Auckland
2.
Melbourne
3.
Sydney
4.
Toronto
5.
Dublin
6.
Canberra
7.
Tehran
8.
Montreal
9.
Oslo
10.
Birmingham
11.
Detroit
12.
SanFrancisco
13.
NewYork
14.
Vancouver
15.
London
16.
Stockholm
17.
Kobe
18.
Helsinki
19.
Bangkok
20.
Shenzen