 West Yorkshire Metropolitan Ambulance Service was formed in 1974, bringing together the individual city services which existed across the county.In 1992, it became an NHS Trust, providing 24-hour emergency and healthcare services to more than 2.1 million people across the region.WYMAS covered the whole of West Yorkshire, including the cities of Bradford, Leeds, and Wakefield, and the principal towns of Halifax, Huddersfield and Pontefract.