Smog shrouded the city

UK. London. On Westminster Bridge. (REUTERS / Olivia Harris)





India. Agra. Taj Mahal. (AP Photo / Pawan Sharma)



India. Allahabad, Uttar Pradesh. (AFP PHOTO / SANJAY KANOJIA)



Qatar. Doha. (EPA / YOAN VALAT)



China. Beijing. View Guomao Bridge. (REUTERS / Jason Lee)



USA. Boston, Massachusetts. Boston Harbor. (AP Photo / Michael Dwyer)



USA. New York. Liberty Island. (AP Photo / Santiago Lyon)



USA. Washington DC. Washington Monument. (AP Photo / J. David Ake, File)



Canada. Vancouver. Burrard Inlet. (AP Photo / Darryl Dyck)



UK. London. (REUTERS / Russell Boyce)



USA. Weehawken, New Jersey. Hudson River. (REUTERS / Gary Hershorn)



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