Studies on Pollen Allergy in Delhi.

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Abstract
The volumetric sampling of air was carried out with the Suction Impaction Sampler devised by Tilak and Kulkarni (1970). Pollen counts were expressed as number per cubic meter volume of the air. Based on the percentage of pollen peaks, diurnal patterns of the total count of all the types, and 6 dominant allergens were determined. For these allergens, daily fluctuations were also recorded. The influence of meteorological factors such as temperature, wind, rainfall, relative humidity (RH) and sunshine hours per day on the variation patterns in the concentration of atmospheric pollen was discussed. High pollen catches are favored by 25-30.degree. C temperature, 5-15 km/h wind speed, 60-70% RH and bright, sunny rain-free days. These weather conditions may be conducive for the high discharge, dispersal and deposition of air-borne pollen. Too low or too high temperature, very high wind speed, high humidity, and cloudy and rainy days hinder high pollen catch. [Applicability to human respiratory allergy is implied].