The Royal Australian Air Force is mourning the loss of an airman, who was critically injured in a portaloo explosion during military exercises in July.

RAAF chief Air Marshal Geoff Brown said Air Force Sergeant Michael Dunn died in hospital this morning from injuries sustained during an explosion at Rockhampton Airport on July 25.

Royal Australian Air Force Sergeant Michael Dunn died as a result of injuries he sustained during an explosion at Rockhampton Airport. Credit:Australian Defence Force

Air Marshal Brown expressed his deepest sympathies to Sergeant Dunn's family.

“Sergeant Dunn was highly respected and well-liked by his colleagues. Those who visited Mick since the accident were all affected by the courage and determination that he showed during his treatment and are extremely saddened by his passing,” he said in a written statement.