Air Pollution in Mexio City

In the 1990's, the United Nations declared Mexico City to have the worst air quality in the world. In fact the air is so bad, that it has affected many different animals. One of the biggest factors to Mexico City's air pollution problem is the burning of fossil fuels. The National Institute of Public health says that breathing the air in Mexico City, affects children worse than cigarette smoke does. Most drivers in Mexico City are restricted to only using their cars to one day a week. In spite of all these problems, leaders of Mexico have devised a plan in order to make the city "greener". People have started planting gardens on their roofes', which adds oxygen to the air. Biking is also becoming very popular.