Where should the sampling devices be located?
The best location for a pollen sampler is on a rooftop, several stories from the ground. Rooftop placement provides an open space away from direct exposure to nearby vegetation, as well as protection from vandalism and theft. Elevation of the sampler allows it to collect pollen from a larger surrounding area. Poor placement of the sampler is near biases, contaminants, or obstructions. Locations near air ducts, under over-hanging tree branches, or next to a wall are also examples of poor sampler placement.
