Airborne fungi and pollens of the Washington, D.C., metropolitan area.

Moulds and pollen allergies are common in the Washington, D.C., metropolitan area. In this survey airborne fungi and pollen grains were studied throughout 1977 by weekly sampling for determination of prevalence of types of fungi and pollens. Dominant pollen types were oak (April), pine (April) and ragweed (September), whereas those of fungi were Hormodendrum (June) and Aureobasidium (March).