| Preliminary Conclusions |
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| • | We
see strong urban influences on air toxic |
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| exposures
for some particle components. |
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| • | Personal
exposures are closely associated with |
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| outdoor
concentrations of black carbon, an |
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| indicator
of diesel exhaust particles. |
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| • | Diesel
particle exposures are associated with lung |
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| cancer
and have been suggested to play a role in |
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| asthma. |
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| • | New
studies underway to examine the |
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| diesel/asthma
link. |
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