Weekly Report

18 December 2020

City
Overall Risk
Tree Pollen
Grass Pollen
Weed Pollen
Mould Spores

Covid has disrupted our readings for this week. Data is historical based on previous December findings.

Cape Town

All pollen counts remained low, but grass pollen increased slightly following rain. Tree pollen levels were low and were composed of cypress, mulberry, olive, plane and white stinkwood. Weed pollen levels were low and consisted of English Plantain, ferns and daisy pollen. Mould levels were low, but a small spike for Rust spores was seen

Johannesburg

Mould levels were very low during this sampling period. Pollen levels were low, but grass counts are increasing. Tree pollen was low and consisted of the types: bush willow, cypress, jacaranda, mulberry, eucalyptus, pine and plane. Weed pollen was very low and only daisy and English Plantain pollen was detected.

Pretoria

Grass pollen increased to moderate levels following heavy rain. Tree pollen was low, but cypress, acacia, casuarina, jacaranda, mulberry, eucalyptus, olive, pine, plane, oak and birch pollen was detected in low quantities. Weed pollen was low and consisted of: English Plantain, Stoebe and Fabaceae. Moulds increased in response to recent rains but did not exceed the significant threshold.

Bloemfontein

Tree pollen was low and consisted of pine, palm and ash. Grass levels were very low. Weed pollen was low and was composed of English Plantain, Euphorbia and dandelion. Moulds increased after rain and a strong spike for Cladosporium was seen.

Kimberley

Moulds increased following heavy rain during this sampling period. Significant levels were seen for Alternaria and the Cladosporium count remained low but increased. Grasses increased but trees were were low. Tree pollen included Fraxinus or ash. No weed pollen was detected.

Durban

Pollen levels were all very low. Low grass and trees pollen (white stinkwood only) was seen. No weed pollen was detected. The mould levels were very high. Alternaria, the dry air spore disappeared from the air due to humidity while ascospores surged to very high levels.

Port Elizabeth

The spore trap stopped after Day 3. Counts were adjusted accordingly. Very low mould counts were seen and low pollen levels were detected in the categories: trees, grasses and weeds. Of the tree types, only pine was detected and no grass or weed pollen was detected

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