Businessweek reports on a study of the health consequences of WTC dust for Ground Zero workers...

The study was funded by the U.S. National Institute on Deafness and Other Communication Disorders.

The findings are based on an investigation involving 102 volunteer and paid post-9/11 World Trade Center workers.

Although most of the study participants were unaware of any smelling hardship, the authors found that two years after the exposure, 22 percent of the workers were less able to detect odors, while almost 75 percent were less able to detect irritants that cause pain, tingling, burning, stinging and/or prickling.

In terms of irritant detection, such long-term smelling impairment was harshest among those who were on the World Trade Center site immediately following the buildings' collapse. Such workers were rendered almost totally unable to detect irritants, the researchers found.

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Yet more reason to investigate and prosecute those responsible for the controlled demolition of the World Trade Center on 9/11.