Tests of Wiltshire Air Ambulance's helicopter and airbase have confirmed there has been no contamination of the deadly nerve agent.
The 'highly precautionary' tests came after paramedics came into contact with victims of Novichok poisoning.
Charles Rowley, 45, and Dawn Sturgess, 44, fell ill in Amesbury, near Salisbury, on June 30 after being contaminated by the nerve agent.
Ms Sturgess died eight days after as a result of the poisoning.
The base at Semington was temporarily closed and the aircraft grounded on August 1st for testing to take place.
During that time, emergency cover was provided by the charity's Rapid Response Cars which carry the same medical equipment as the helicopter.
The base and the helicopter will be operating as normal from tomorrow (Wednesday 15 August 2018).
It is not clear how the disruption will effect the charity's fundraising.
Public Health England remains the same with the risk to the public remaining low.