In order to establish a procedure for sampling four fungicides (pyrimethanil, metalaxyl-M, myclobutanil and fenhexamid) and the insecticide malathion, Tsiropoulus et al. [58] have evaluated the retention efficiency and carried out breakthrough tests for four solid sorbents (XAD-2, XAD-4, Supelpak-2, Florisil and C-18). In general the retention efficiency remained constant for all the sorbents and compounds except in the case of fenhexamid on XAD-4 and Florisil, where a decrease on trapping efficiency was observed when the amount of pesticides was increased. Retention efficiency was examined by fortification of the sampling cartridge into the front bed with different amounts of pesticides, and ambient air was pulled through the tubes at different rates. However, this study uses low-volume rate (1–2 lmin−1) and the method was not applied for monitoring ambient air, but to monitor malation and fenhexamid in greenhouse air after application. Supelpak-2 and Florisil were selected based on their performance characteristics.