1) Beijing, China Beijing is not actually among the 10 cities most affected by pollution, but currently, its inhabitants awaken increasingly often surrounded in dense smoke. Smog in the air to exceed 500 micrograms per cubic meter. People can not go outside without a mask. 2) Ahvaz, Iran The city of Ahvaz, Iran, is the most polluted city in the world. Responsible factories are engaged in the distillation of petroleum and metal processing and gas located around the city. 3) Ulan Bator, Mongolia The capital of Mongolia is not only cooler but also the second most polluted city in the world. 70 percent of smog is produced in winter heating stove. 4) Lahore, Pakistan Environmental pollution is one of the most serious problems in Pakistan. Especially dramatic is the situation in Lahore, the second largest city. The reason for the pollution, and excessive traffic and garbage incineration, is dust that comes from the desert regions. 5) New Delhi, India In New Delhi, 9 million 900 thousand inhabitants, the number of vehicles increased in 30 years from 180,000 to nearly 3,500 million. However, they are mainly coal power plants which contribute to pollution, producing 80 percent of emissions. 6) Riyadh, Saudi Arabia Sandstorms like here in Riyadh, favor the development of smog by increasing the concentration of airborne particles. The intense sunlight becomes dirt emissions from industry and traffic in ozone. 7) Cairo, Egypt The poor air quality in Cairo causes chronic diseases respiratory in the airways and lung cancer, causing the deaths of between 10,000 and 25,000 people per year. The reason for pollution is the excessive automobile traffic and an industry that is growing rapidly. 8) Dhaka, Bangladesh A study by the Max Planck Institute, Mainz, in New York and Tokyo die annually about 500 people as a result of environmental contamination. In Dhaka, seven million people are almost 15,000. There, the researchers measured the highest concentration of sulfur in the world. 9) Moscow, Russia The polluted air of large cities is composed of various particles. In Moscow, is formed mainly by a high concentration of hydrocarbons. The west wind, which blows all year, working with some fresh air, at least in certain parts of the city. 10) Mexico City, Mexico Pollution in Mexico City is compounded by its geographical location . It's in the Valley of Mexico, a large basin of the high plateau in the central region, and it surrounds the Popocatepetl volcano, 5,500 meters high. Because of the high content of sulfur and hydrocarbons from air for a long time it was considered to Mexico City the most polluted city in the world.

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