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South Middlesex EMS South Middlesex EMS Partnering with EMS agencies and hospitals in Greater Boston in pursuit of excellent prehospital care South Middlesex is a federally chartered nonprofit corporation that supports emergency medical service providers and agencies in Cambridge Massachusetts and the surrounding communities. South Middlesex is a federally chartered nonprofit corporation that supports emergency medical service providers and agencies in Cambridge Massachusetts and the surrounding communities. SMEMS provides review of clinical cases provides education and consultation on the implementation of new therapies and equipment for prehospital care. SMEMS provides review of clinical cases provides education and consultation on the implementation of new therapies and equipment for prehospital care.