10 most polluted Cities

Hello, today at Enrich I looked at the ten most air polluted cites in the world. Lahore, Pakistan was number 10 air polluted with 200 micrograms per cubic meter in the world. Followed by Kanpur, India is number 9 air polluted with 209 micrograms per cubic meter. Then Yasouj, Iran is number 8 air polluted with 215 micrograms per cubic meter. Next was Gaborone, Botswana is number 7 air polluted with 216 micrograms per cubic meter.After was Peshawar, Pakistan is number 6 with 219 micrograms per cubic meter. Afterwards was Kermanshah, Iran is number 5 with 229 micrograms per cubic meter. Followed by Ludhiana, India is number 4 with 251 micrograms per cubic meter. Then Sanandaj, Iran is number 3 with 254 micrograms per cubic meter. Next was Ulaan Baator, Mongolia is number 2 with 279 micrograms per cubic meter. And finally, the most polluted city is...... Ahvaz, Iran With 372 micrograms per cubic meter!!! I wondered how come there wasn't any cities from China in the top ten air polluted cities. And a fact is there was four cities from Iran in the top ten.