Fig. 2. Representation of the pesticide-treated area in Bologna. (a) The pesticides were applied in 5-m segments (rectangles) with a total area of 495 m2 reproducing a quasicircle (dashed line) with an area of 491 m2. (b) Representation of the soil sampling grid: each soil sample was collected in each square cluster. (c) The sampling instrumentation for air: 1, glass cartridge; 2, polyurethane foam (PUF) plug; 3, tygon pipe; and 4, programmable pump.