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The establishment of EVISA is funded by the EU through the Fifth Framework Programme (G7RT- CT- 2002- 05112).

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virtual impactor

Instrument used to sample particles of a given size range according to their inertia. Particles are removed by impacting them through a virtual surface into a stagnant volume, or a volume with a slowly moving airflow, so that large particles remain in this volume while smaller particles are deflected with the bulk of the original air flow;  the dichotomous impactor is a frequently used virtual impactor.


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