This is an area of ongoing research, however it is gen
erally
acknowledged in the industries involved that there is a 
risk of
Legionellosis from the spray of an active coling tower. 
This is not much
of a risk, as the real menace is generally involved in
 water that "sits"
and is then sprayed at some later time. But if I wer
e advising in this
situation, I would REQUIRE the men to wear respiratory p
rotection when
downwind of the tower.
 
The best leads on the subject are on the internet and 
many come from the
list in section IX of the AWT Position paper (available 
at AWT.org)
which is one of the better papers on the subject.
 
Phil Anderson
Technical Director
Aqua Science, Inc.
 
 

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