||Air pollution exerts both direct and indirect effects on the amount of pollen in the air and its allergenicity. Indirect effects result from growths stress on the plants, reducing productivity so that fewer and smaller pollen grains are produced. However, evidence indicates that these cases the pollen grains have enhanced allergen content. Direct effects can occur through exposure of pollen on the plant or during flight in air. The surface of the grains is slightly sticky, which result in particles collecting on the surface and can modify their antigenic potency. A structural and morphological analysis of the pollen grains of three allergenic species from Oradea area was carried out. Some of the species presented minor deviations, morphological and structural changes, reduction of the exine reticulation, and changes in the number of pores, sedimentation substances, which appear as unspecific excrescences visible with an optical microscope. These small changes, as well as other exogenous factors, are able to explain the yearly increase of the allergenic potential of the plants subjected to analysis.
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