Air sampling studies in a tropical area. Four year results.

Air sampling studies carried out in Caracas. Venezuela indicate that in this tropical area pollen and fungus spores of allergenic potential are airborne throughout the year. The pollen grains of conifers, mulberry and grasses are the most frequently encountered. Many more fungus spores than pollen grains are recovered from the air; among the former, Cladosporium spores are the most frequent and abundant.