During the surnmer of 2001, field studies were performed to evaluate the effects of carbondioxide (CO2) and l-octen-3-ol (octenol) on the ability to collect Aedes albopictuss with Centers for DiseaseControl (CDC) Fay-Prince traps. Results from these studies indicated that Ae. albopictus is significantly moreattracted to CO2- or CO2 + octenol-baited CDC Fay-Prince traps than unbaited or octenol-baited traps. However,the difference between the responses to CO2 and CO2 + octenol was not statistically different, indicating thatCO2 is driving the response of Ae. albopictus to CDC Fay-Prince traps.