Death by carbon monoxide is totally painless,
so anything else is more painful.
Zyklon-B and carbon monoxide
Carbon Monoxide or Zyklon b
Zyklon B ir Carbon Monoxide
Zyklon B, a brand name for a form of Hydrogen Cyanide
Zyklon B in some camps but most camps used carbon monoxide
The most common way people died in Treblinka was by Gassing but not by Zyklon B but instead by Carbon Monoxide.
At Belzec, Chelmno, Sobibor and Treblinka - carbon monoxide. Hydrocyanic acid in a Zyklon B base - Auschwitz and Majdanek. All other camps used carbon monoxide. Zyklon-B, a cyanide compound developed for the purpose of inexpensively delousing clothes. It came in cans in the form of pellets. When the pellets came into contact with air, heat and water they gave off hydrogen cyanide gas. The designers of Zyklon-B had never anticipated its use on people.
I believe it was carbon monoxide used in gassing chambers. They later used pellets (Zyklon B) which convert to poison when exposed to air.
Zyklon B, a cyanide based insecticide was used in most cases. In some instances, carbon monoxide from truck exhausts was used.
The Germans used Zyklon B for killing people in the concentration camps.
Gases used in extermination camps1. Zyklon B (hydrocyanic acid) - used at Auschwitz II and Majdanek2. Carbon monoxide - used at the other extermination camps (Chelmno, Treblinka, Sobibor, Belzec and others).
Zyklon-B, an industrial-strength pesticide, was poured through openings in the roofs of the gas chambers. When exposed to air, Zyklon-B gives off a highly toxic gas. The Allies found millions upon millions of empty Zyklon-B containers when they raided the death camps. Diesel engine exhausts were also used, either in the "showers" or in gas vans that they transported Jews to the site in.