Portnoy. 2004. This
editorial discusses the factors affecting pollen concentration (type and
location of sampler, elevation, local vegetation, diurnal variations, etc.) and
symptoms (duration of exposure, individual sensitivities, and how symptoms are
evaluated). The author also points out
that pollen and spore counts are only a surrogate for total allergen exposure.
Paucimicronic aerosols increase the total exposure.