Parietaria is a weed from the family Urticaceae. Parietaria concentrations are steadily rising in Cape Town. Current heavy rain will have washed this pollen from the air, but it will reach its highest concentrations in the last week of May and decrease in early June. Tree and grass pollen concentrations were low. Fungal spore levels were similarly low, despite small peak on sunny days for basidiospores, ascospores and Cladosporium.