A 3 YEAR (1993-1995) CALENDAR OF POLLEN AND ALTERNARIA MOLD IN THE ATMOSPHERE OF SOUTH WESTERN SYDNEY

The relevance of allergy skin prick testing in the diagnosis and treat ment of seasonal allergic rhinitis and pollen asthma can usefully be i nterpreted in relation to the timing and duration of seasonal symptoms and the presence of pollen and mould spores in the air. This calendar has been constructed from three years continuous observations of poll en and Alternaria mould spore counts between January 1993 and December 1995, using a Burkard 7-day volumetric spore trap. Of the total airbo rne pollen, tree pollen comprises 65%, weeds and herbs 11% and grasses 18%. Unidentified pollen, ''other'' group, accounts for 6% of the tot al airborne pollen. The most numerous of the tree pollen is that of th e introduced trees cypress (Cupressus spp.) and privet (Ligustrum spp. ). Grass pollen is seen in small numbers throughout the winter but sho ws a rapid increase in spring to peak in mid to late November. Weeds p ollinate from early spring through to summer. Alternaria mould, which is a risk factor for childhood asthma, occurs mainly in late spring an d summer but is present in small numbers intermittently throughout win ter.