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Ongoing research is likely to reveal that fine PM from different sources is not equal in toxicity. Particles emitted from different sources differ not only in toxicity, but also tremendously in their probability of actually exposing someone (e.g. 0.5 for mainstream tobacco smoke, 0.001 for ETS, 0.00001 for street traffic, 0.000001 for large power plant, (Smith 1993). Furthermore the control of PM exposure will ultimately have to happen at the sources. Consequently the linkage from sources to exposures is essential for risk assessment and management.

We present here the first results of source, apportionment of the PM(2.5) exposures and indoor and indoor microenvironment concentrations measured in (the EXPOLIS study in Helsinki, Finland to the main source categories. As the respective EXPOLIS PM(2.5) samples have been collected and partly analysed also from Athens, Basel, Grenoble, Milan, Oxford and Prague, we hope that we can also analyse and publish the source apportionment data from these cities in near future. .

Additional information

Authors: JANTUNEN M, EC-JRC/Environment Institute, Air Quality Unit, Ispra (IT);KOISTINEN K, KTL-Environmental Health, Kuopio (FI);MATHYS P, University of Basel (CH);KUNZLI N, University of Basel (CH);STARN W, University of Basel (CH);EDWARDS R, UC Berkeley, California (US)
Bibliographic Reference: An oral report given at a Conference on: Understanding the Health Effects of Particulate Air Pollution: Recent Advances and Outstanding Questions Organised by: WHO/HEI Held in: Brussels, 5-7 March, 2001
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