The KhAB-500 is the provisional naming of a series of World War II-era aerial bombs developed by the Soviet Air Force to deliver chemical weapons.
[1] Upon detonation, the KhAB-500 R-10 would create a hemispherical cloud of gas with a radius of 20–25 m (66–82 ft).
In ideal weather conditions, the phosgene cloud could produce serious medical effects up to 500 m (1,600 ft) downwind.
[1] The KhAB-500 was carried by Soviet Union era aircraft.
[2] The bomb was removed from service as a result of the Chemical Weapons Convention in the early 1990s.