High Quality Content by WIKIPEDIA articles! Ornge (formerly Ontario Air Ambulance) is the air ambulance service for the province of Ontario and for the Ministry of Health and Long-Term Care (Ontario). The provision of ambulance services in Ontario is governed by the Ambulance Act, which states that the Minister of Health "has the duty and the power" to make sure Ontario is serviced by a "balanced and integrated system of ambulance services and communication services used in dispatching ambulances”. Its headquarters are in Mississauga, Ontario, Canada.