It's not ignited, this is how airplane oxygen systems work. A phosphorus match provides the activation energy (as heat), which causes the decomposition of Sodiu

It's not ignited, this is how airplane oxygen systems work. A phosphorus match provides the activation energy (as heat), which causes the decomposition of Sodium Chlorate (NaClO3) to Sodium Chloride (NaCl, table salt) and free oxygens. The oxygens combine to form atmospheric oxygen (O2).