Abstract

Grass pollen is the major factor in the outdoor environment triggering hay fever and asthma in spring and early summer. During the past thirty years, the incidence of these allergic diseases in the human population in many parts of the world has doubled (Wuthrich, 1989; Burney et al., 1993), suggesting among many possible explanations either that the amount of allergens in the atmosphere has increased or that environmental air pollution may be exacerbating symptoms. This chapter reviews the molecular biology of certain grass pollen allergens and incidence of these allergens in the air as estimated either by pollen counts or allergen load analysis.

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