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Chennai Pollen Watch - Typha angustata

Cocos nucifera (Coconut) 33.0%

Tamarindus indica (Puli) 26.3%

Parthenium hysterophorus (Parthenium) 11.0%

Prosopis juliflora (Velikaruvel) 8.9%

Cassia siamea (Manjakkonai) 2.8%

Typha angustata (Sambu) 2.8%

Others 15.3%

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The above data represents the result of continuous pollen monitoring conducted between July 13 and July 19. The monitoring is done by exposing adhesive coated glass cylinder in the Vertical Cylinder Trap for a period of 24 hours, installed at a height of 15 meters in 5 different zones (Anna Nagar, Gandhi Mandapam, Royapettah, Villivakkam and Washermenpet) in the city of Chennai. The results are presented as mean of all five sites. Though the atmosphere of Chennai consists of a large number of pollen types only a few are represented in the data according to their dominance. The report shows the predominance of the pollen of Cocos nucifera, Tamarindus indica, Parthenium hysterophorus, Prosopis juliflora, Cassia siamea and Typha angustata in that order.

The pollen grains of Cocos nucifera have been dominating the atmosphere of Chennai city continuously. It has contributed around 33% to the total. This was followed by Tamarindus indica with a contribution of 26.3% to the total. The pollen grains of Parthenium hysterophorus (11%) occupied the third position. The other significant contributors are Prosopis juliflora (8.9%), Cassia siamea (2.8%) and Typha angustata (2.8%). The other pollen types contributed around 15.3%. A total of 22 pollen types were recorded.

(Fact file: Asthma in childhood is predominantly a male disease. At puberty, the gender ratio equalizes; following puberty, asthma incidence is greater in women. J.M.Phadtare, et al., IJCP-Allergy and Asthma: A Clinical Primer, 1999).

Compiled by V.Raju, B.P.R.Vittal, N.K.Udaya Prakash, T.Janaki and S.Bhuvaneswari.

Asthma and Allergy Research Institute, Raju Hospital, T.Nagar,Chennai - 600 017
Centre for Advanced Studies in Botany, University of Madras,
Guindy Campus, Chennai - 600 025

Queries to: chennaipollen1@yahoo.co.in

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