Burning bodies created logistical and secrecy problems for Auschwitz

Evidence

Hoess’s biggest problem, he says, lay in the disposal of the dead bodies. Open air incineration spread the stench of burning flesh for miles and caused the whole neighborhood to talk about the burning of Jews. Moreover, the air defense services protested that the fires could be seen from great distances at night. — Bob Altemeyer, The Authoritarian Specter, 3173