A wetted wall cyclone system for sampling an aerosol. In an embodiment, the system comprises a cyclone body including an inlet end, an outlet end, and an inner flow passage extending therebetween. In addition, the system comprises a cyclone inlet tangentially coupled to the cyclone body proximal the inlet end. The cyclone inlet includes an inlet flow channel in fluid communication with the inner flow passage of the cyclone body. Further, the system comprises a skimmer coaxially coupled to the outlet end of the cyclone body. The skimmer comprises a separation end extending into the outlet end of the cyclone body, a free end distal the outlet end of the cyclone body, and an inner exhaust channel in fluid communication with the inner flow passage of the cyclone body. Still further, the system comprises means for reducing the temperature of at least a portion of the cyclone body.