Nitrogen gas execution methods involve placing a gas mask to replace breathable air with pure nitrogen, causing death by lack of oxygen (hypoxia).
October 08, 2025
high
procedural
General description of how nitrogen-based executions are carried out.
By 2024, the state of Alabama had begun using nitrogen gas to carry out some executions.
January 01, 2024
high
temporal
State-level adoption of nitrogen gas as an execution method.