At the end of the 1939–40 New York World's Fair in 1940, debris from the demolition of the fair exhibits was used to fill the section of the future Kissena Corridor west of Main Street (today's Queens Botanical Garden). By 1941, the New York City Department of Sanitation led by Commissioner William F. Carey began planning to fill the Kissena Corridor site between Main Street and Kissena Boulevard with municipal waste as a landfill. Afterward, the landfill would be excavated to install the sewer, and would act as a cover for the sewer. At the time, using garbage to fill the marshlands was considered more economical than filling it with clean dirt. In addition, the fill would help mitigate mosquitoes which inhabited the area around Kissena Creek. An existing landfill was already present on Rose Avenue in Kissena Park. This dump, which collected ashes, garbage, and refuse from Flushing, began operations in the 1930s. A second Kissena Park landfill on North Hempstead Turnpike (Booth Memorial Avenue) was opened on November 14, 1943 and closed in July 1945.