A method for passive or active sampling of particles and gas phase components in a fluid flow. A sampling device is provided in the fluid flow, wherein the sampling device comprises an ionization chamber and a detection chamber. A fraction of the particles and the gas phase components in the fluid become ionized and charged when introduced in the ionization chamber. The charged particles and gas phase components are then introduced in the detection chamber, which comprises a positively charged wall surface and a negatively charged wall surface. The positively charged particles and gas phase components are bound to the negatively charged wall surface, and the negatively charged particles and gas phase components are bound to the positively charged wall surface. The amount of particles present in the fluid flow is determined by measuring the current change between the positively charged wall surface and the negatively charged wall surface.
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