Under the plume: September 11 produced a new kind of pollution, and no one knows what to do about it. (Cover Story).

FROM HIS HEALTHY HEAD OF HAIR TO HIS RUNNING shoes, Andy Reeve, a young computer programmer, was covered in white soot and ash. He had just arrived for work across the street from World Trade Center that horrible September morning, when a commercial jet slammed into the tower at his back.

"I was on Wall Street when the explosion happened. You couldn't see anything. It was completely dark. It was hard breathing. In 20 minutes I made it outside and it was like snowing ... snowing the World Trade Center," Reeve told me as we stood on the Brooklyn Bridge the morning of ...

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