| Valley Of Mexico |
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Geography The Valley of Mexico is roughly 35 miles (60 km) east-to-west and 50 miles (80 m) north-to-south. The valley is an , Chalco , Xochimilco , Zumpango, and Xaltocan. These have since been drained and little of their original expanse remains — today the greater Mexico City urban area covers nearly the entire valley. Pollution woes Air pollution associated with this urban environment, consisting primarily of ozone, sulfur dioxide, and suspended particles, is trapped by natural contours of the valley. In winter, Thermal Inversion s add to the woes. This has led many organizations, from the World Resources Institute to the Guiness Book Of World Records , to designate Mexico City as the most polluted major city in the world. The air reached unhealthful levels 355 days during 1991, improving to 170 days in 2003, and 141 in 2004. http://www.azcentral.com/specials/special03/articles/0118Air18.html Article on pollution Climate The Valley of Mexico averages roughly 7350 feet (2240 meters) above sea level. Although the valley is located within the tropical zone, the high altitude keeps it relatively temperate. The annual median temperature is between 61° - 64° F (16° - 18° C) and seasonal changes are small. Night frosts can occur in the coldest months, but even in January the average high is 70° F. April and May are the warmest months. The rainy season, which usually lasts from late May until early October, accounts for 80% of the annual 33 inches (850 mm) of rainfall and moderates the usual dryness of the air. Footnotes |