3.1 the situation3.1.1 domestic situation, MexicoIn Mexico City, said the County is one of the largest capital city in the world with a population of about 20 million people. Mexico City's subway system is considered a transportation system that is environmentally friendly. Mexico City subway system opened its first line in 1969, employs approximately 14,000 people work in this system covers 201.3 km allocated to 11. Heels way over 175 stations, in daily life, there are passengers travelling 4,200,000 Metro stations and 106 53 texture image station together people living in Mexico City paid 0.3 subway system for three hours, although a relatively short interval, but passengers are exposed to sur.Allow any sector from the microenvironment because different ventilation is not good. There is no sunlight and dust from the traffic circulating it continuously. Several environmental studies and the risks that have been conducted in several countries, the subway system showed that the concentration of dust in the environment and other indoor and outdoor. Studies at Mexico City, found that the effects of dust per biodiversity and health. Dust that is associated with an increase in heart disease, and respiratory disorders and death touch. It has been reported that dust in the subway poisoning more than dust in the air, the environment in General, and the toxicity of dust compared to metal welding dust will appear in the PM that leads to stress resulting from oxidation through the creation of free radicals are harmful, that could happen to their health, especially. Dust, water soluble type of metal which, in Mexico City, to study samples of dust. PM 2.5 in situations where different types of transport, including the Metro.
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