The grass pollen concentration has increased to moderate levels. Some tree pollen is still high (cypress and oak) but tree pollen concentrations are decreasing. Olive, gum, plane, pine and poplar tree pollen is present in the air in low concentrations. Weed pollen concentrations are low but erica (heather), goosefoot and sorrel are present. The fungal spore load is generally low but significant Alternaria spores were present during the past sampling week especially following days with rain.