University of Worcester Worcester Research and Publications

The Incidence of Increases Pollen Concentrations During Rainfall in the Air of London

Emberlin, Jean and Norris-Hill, J. (1993) The Incidence of Increases Pollen Concentrations During Rainfall in the Air of London. Aerobiologia, 9 (1). pp. 27-32. ISSN Print: 0393-5965 Online: 1573-3025

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Data from a Burkard volumetric sampler in a densely built-up area of North-central London, England are used to investigate the effects of rainfall on pollen concentrations over four years. Pollen counts generally decreased with rainfall, although several episodes of increased pollen concentration have been recorded in London following the onset of precipitation.
Pollen concentration is recorded as two-hourly pollen counts, while hourly records of nine meteorological variables, including rainfall amount and intensity, are obtained from the London site of the Meteorological Office. The two-hourly changes in concentration that take place during both «normal» rainfall events and during those displaying marked increases in pollen concentration are examined in relation to the patterns of rainfall, the wind regimes, synoptic situation and general characteristics of urban areas.
The influence of rainfall in removing pollen from the air is also examined in relation to the rainfall intensity and size of pollen grains for selected taxa.

Item Type: Article
Additional Information:

The original publication is available at

Originally deposited as National Pollen and Aerobiology Research Unit (NPARU)

Uncontrolled Discrete Keywords: aerobiology, pollen, rainfall, London, pollen counts, NPARU
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QR Microbiology
Divisions: College of Health, Life and Environmental Sciences > School of Science and the Environment
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Depositing User: Janet Davidson
Date Deposited: 27 Sep 2007 12:59
Last Modified: 17 Jun 2020 16:48

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