Mexico's Popocatepetl Volcano is a 5,426-meter peak that has been spewing toxic fumes, ash and lumps of incandescent rock for almost 30 years, and has been the most visible potential danger to the city of 22 million people. Every time there is a sigh, tic or heave in the volcano, there are dozens of scientists, a network of sensors and cameras, and a roomful of powerful equipment watching its every move. The volcano is 72 kilometers southeast of Mexico City, but looms much closer to the eastern fringes of the metropolitan area. For most of the years since the volcano stoplight was introduced, it has been stuck at some stage of "yellow." The mountain sometimes quiets down, but not for long.

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