Hazardous area response team

A hazardous area response team (HART) is an NHS ambulance service in the United Kingdom devoted to providing medical care to patients in the "hot zone" of hazardous environments.
Teams are activated and sent to various incidents, such as CBRNe, hazmat, collapsed buildings, patients at height or in confined space, water rescue, and flooding, firearms incidents and explosions.
HART teams are made up of emergency medical personnel, such as paramedics who have undergone specialised training in the use of special procedures, skills and vehicles and equipment. Their specialised equipment includes personal protective equipment (such as breathing apparatus, hazmat suits, and climbing tethers for working at height), cutting equipment for extrication, and flotation devices and rafts for working on water.
Origins.
Hazardous area response teams originated from a 2004 report on the feasibility of paramedics working in the hot zone or inner cordon of major incidents.
Capabilities.
All 16 HART teams within the ambulance services of England & Wales have the same capabilities.
Gen 1 HART (most vehicle no longer in service)
Gen 2 HART vehicles:
These Incident Response Units carry All HART capabilities. Including Chemical, Biological, Radiological, Nuclear and Explosives (Hazmat/Hazmed), MTA – Marauding Terrorist Attack (TMO)including Fire Arms, SWAH – Safe Working at Height, USAR - Urban Search and Rescue, Confined Spaces, Unstable Terrain, Water Operations and supporting security operations 
The IVECO and Polals are Gen 1 HART and may soon be replaced by a simplified "all-wheel drive flatbed van with a ramp for loading and unloading" and ATV vehicle. 
Operational areas.
A HART is operational in every NHS ambulance service in England and Wales.
Similar capabilities exist within the Scottish Ambulance Service - Special Operations Response Team (SORT)
Northern Ireland Ambulance Service and Isle of Man Ambulance Service.