World's 10 Highly Polluted Cities

3. Sanandaj, Iran: Also known for its manufacturing industries, Sanandaj produces a range of goods, from carpets to cotton, woodwork to metalware. It is another city of western Iran famed for its numerous manufacturing industries. While the main cause of air pollution in this city is largely undetermined, it emerges as the third most polluted city in the world. It records for 254 micrograms of polluting particles per cubic meter. Outside the city is a landscape of beautiful hills and mountains, but the city itself has turned into a sea of smog and commerce.

4. Ludhiana, India and Quetta, Pakistan: In the fourth spot, Ludhiana in India shares the same ranking with Quetta in Pakistan. Ludhiana records for 251 micrograms of polluting particles per cubic meter.

It is the largest city in the state of Punjab, and one of the richest in the whole of India. They produce 50 percent of India's bikes and 60 percent of their tractor parts.
Meanwhile, Quetta records for 251 micrograms of polluting particles per cubic meter. It is a high-altitude city well-known as the "Fruit Garden of Pakistan" because of its diverse plant and animal life. The city is also a transportation hub known for its railways and airport.

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