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For frequently two years a period of the range and quantity of pollen grains in the most inhabited rooms of each of 4 dwellings in Sofia was studied, together with the outdoors air pollen spectra. Changes in the health status of the inhabitants affected by pollinosis were recorded at the same time. The characteristic pollen taxa, pollen interference periods and the way sensitive patients were affected were evaluated.
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Raina Yankova (1991) studied this question.
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