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A list of the world cities with highest pollution levels:
Rank, city, country, pollution level
1 Delhi, India 153
2 Patna, India 149
3 Gwalior, India 144
4 Raipur, India 134
5 Karachi, Pakistan 117
6 Peshawar, Pakistan 111
7 Rawalpindi, Pakistan 107
8 Khormabad, Iran 102
9 Ahmedabad, India 100
10 Lucknow, India 96
11 Firozabad, India 96
12 Doha, Qatar 93
13 Kanpur, India 93
14 Amritsar, India 92
15 Ludhiana, India 91
16 Idgir, Turkey 90
17 Narayonganj, Bangladesh 89
18 Allahbad, India 88
19 Agra, India 88
20 Khanna, India 88
Source: World Health Organization
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