Top polluted cities of World

Lahore, Pakistan is at the top position in this list.
National capital Delhi comes at second position in this list.
Karachi, Pakistan reserves third position in this list.
Dhaka, Bangladesh comes at fourth position.
Kolkata reserves fifth position in the list.
Mumbai comes at sixth position in the list.
Jakarta, Indonesia reserves seventh position.
Hanoi, Vietnam comes at eight position.
Baghdad, Iraq reserves ninth position.
Ho Chi Minh city, Vietnam comes at tenth position.