Pollen grains in the atmosphere of Didim, collected using a Durham sampler, were investigated in 2004 and 2005. Weekly pollen grains per square centimetre were calculated. Over a period of 2 years, 17,518 pollen grains/cm 2 belonging to 40 taxa and unidentified pollen grains were recorded. In 2004, 9,879 pollen grains were counted per cm 2 , and in 2005 the value was 7,639 per cm 2 . The majority of pollen grains investigated were Pinus spp. (45.58%), Cupressaceae/Taxaceae (13.49%), Olea spp. (9.19%), Platanus spp. (7.62%), Gramineae (6.33%), Pistacia spp. (4.34%), Morus spp. (3.81%), Quercus spp. (2.02%), Abies spp. (1.39%), and Plantago spp.(1.11%). During the month of April, 40.46% of total pollen grains were recorded. According to our results, pollen season durations for the dominated pollen grains in Didim were: the 7th-33rd weeks for Pinus spp., nearly the whole year except summer for Cupressaceae/Taxaceae, the 17th-29th weeks for Olea spp., the 10th-24th weeks for Platanus spp., the 8th-46th weeks for Gramineae, the 8th-20th weeks for Pistacia spp., the 11th-21st weeks for Morus spp., the 17th-21st weeks for Quercus spp., the 9th-27th weeks for Abies spp., and the 7th-26th weeks for Plantago spp.
