Firefighter

Firefighters had to focus their efforts on saving the adjacent church instead of this burning building, an abandoned convent in Massueville, Quebec, Canada

Firefighter carrying out a ladder slide

A fire burns due to the presence of three elements: fuel, oxygen and heat. This is often referred to as the fire triangle. Sometimes it is known as the fire tetrahedron if a fourth element is added: a chemical chain reaction which can help sustain certain types of fire. The aim of firefighting is to deprive the fire of at least one of those elements. Most commonly this is done by dousing the fire with water, though some fires require other methods such as foam or dry agents. Firefighters are equipped with a wide variety of equipment for this purpose that include ladder trucks, pumper trucks, tanker trucks, fire hose, and fire extinguishers.

See also Fire suppression for other techniques.

While sometimes fires can be limited to small areas of a structure, wider collateral damage due to smoke, water and burning embers is common. Utility shutoff (such as gas and electricity) is typically an early priority for arriving fire crews. In addition, forcible entry may be required in order to gain access into the structure. Specific procedures and equipment are needed at a property where hazardous materials are being used or stored.

Structure fires may be attacked with either "interior" or "exterior" resources, or both. Interior crews, using the "two in, two out" rule, may extend fire hose lines inside the building, find the fire and cool it with water. Exterior crews may direct water into windows and other openings, or against any nearby fuels exposed to the initial fire. Hose streams directed into the interior through exterior wall apertures may conflict and jeopardize interior fire attack crews.

Buildings that are made of flammable materials such as wood are different from building materials such as concrete. Generally, a "fire-resistant" building is designed to limit fire to a small area or floor. Other floors can be safe by preventing smoke inhalation and damage. All buildings suspected or on fire must be evacuated, regardless of fire rating.

Some fire fighting tactics may appear to be destructive, but often serve specific needs. For example, during ventilation, firefighters are forced to either open holes in the roof or floors of a structure (called vertical ventilation), or open windows and walls (called horizontal ventilation) to remove smoke and heated gases from the interior of the structure. Such ventilation methods are also used to improve interior visibility to locate victims more quickly. Ventilation helps to preserve the life of trapped or unconscious individuals as it releases the poisonous gases from inside the structure. Vertical ventilation is vital to firefighter safety in the event of a flashover or backdraft scenario. Releasing the flammable gases through the roof eliminates the possibility of a backdraft, and the removal of heat can reduce the possibility of a flashover. Flashovers, due to their intense heat (900–1,200 °F (480–650 °C)) and explosive temperaments, are commonly fatal to firefighter personnel. Precautionary methods, such as smashing a window, reveal backdraft situations before the firefighter enters the structure and is met with the circumstance head-on. Firefighter safety is the number one priority.

Whenever possible during a structure fire, property is moved into the middle of a room and covered with a salvage cover, a heavy cloth-like tarp. Various steps such as retrieving and protecting valuables found during suppression or overhaul, evacuating water, and boarding windows and roofs can divert or prevent post-fire runoff.

Wildfires (known in Australia as bushfires) require a unique set of strategies and tactics. In many countries such as Australia and the United States, these duties are mostly carried out by local volunteer firefighters. Wildfires have some ecological role in allowing new plants to grow, therefore in some cases they will be left to burn.[4] Priorities in fighting wildfires include preventing the loss of life and property as well as ecological damage.

A demonstration of a vehicle extrication.

Firefighters rescue people (and animals) from dangerous situations such as crashed vehicles, structural collapses, trench collapses, cave and tunnel emergencies, water and ice emergencies, elevator emergencies, energized electrical line emergencies, and industrial accidents.[5] In less common circumstances, Firefighters rescue victims from hazardous materials emergencies as well as steep cliffs, embankment and high rises - The latter is referred to as High Angle Rescue, or Rope Rescue. Many fire departments, including most in the United Kingdom, refer to themselves as a fire and rescue service for this reason. Large fire departments, such as the New York City Fire Department and London Fire Brigade, have specialist teams for advanced technical rescue. As building fires have been in decline for many years in developed countries such as the United States, rescues other than fires make up an increasing proportion of their firefighters' work.[6]

Firefighters frequently provide some degree of emergency medical care. In some jurisdictions first aid is the only medical training that firefighters have, and medical-only calls are the sole responsibility of a separate emergency medical services (EMS) agency. Elsewhere, it is common for firefighters to respond to medical-only calls. The impetus for this is the growing demand for emergency medicine and the decline of fires and traditional firefighting call-outs[6]—though fire departments still have to be able to respond to them—and their existing ability to respond rapidly to emergencies. A rapid response is particularly necessary for cardiac arrests, as these will lead to death if not treated within minutes.[7]

The dispatch of firefighters to medical emergencies is particularly common in fire departments that run the EMS, including most large cities of the United States. In those departments, firefighters are often jointly trained as emergency medical technicians in order to deliver basic life support, and more rarely as paramedics to deliver advanced life support. In the United Kingdom, where fire services and EMS are run separately, fire service co-responding has been introduced more recently.[8] Another point of variation is whether the firefighters respond in a fire engine or a response car.[9] Either way, separate employees to crew ambulances are still needed, unless the firefighters can work shifts on the ambulances.

Airports employ specialist firefighters to deal with potential ground emergencies. Due to the mass casualty potential of an aviation emergency, the speed with which emergency response equipment and personnel arrive at the scene of the emergency is of paramount importance. When dealing with an emergency, the airport firefighters are tasked with rapidly securing the aircraft, its crew and its passengers from all hazards, particularly fire. Airport firefighters have advanced training in the application of firefighting foams, dry chemical and clean agents used to extinguish burning aviation fuel.

Decontamination after a chemical spill

Fire departments are usually the primary agency that responds to an emergency involving hazardous materials. Specialized firefighters, known as hazardous materials technicians, have training and certification in chemical identification, leak control, decontamination, and clean-up procedures.

Firefighters frequently give fire prevention talks at schools and community events

Fire departments frequently provide advice to the public on how to prevent fires in the home and work-place environments. Fire inspectors or fire marshals will directly inspect businesses to ensure they are up to the current building fire codes,[10][11] which are enforced so that a building can sufficiently resist fire spread, potential hazards are located, and to ensure that occupants can be safely evacuated, commensurate with the risks involved.

Fire suppression systems have a proven record for controlling and extinguishing unwanted fires. Many fire officials recommend that every building, including residences, have fire sprinkler systems.[12] Correctly working sprinklers in a residence greatly reduce the risk of death from a fire.[13] With the small rooms typical of a residence, one or two sprinklers can cover most rooms. In the United States, the housing industry trade groups have lobbied at the State level to prevent the requirement for Fire Sprinklers in one or two family homes.[14][15]

Other methods of fire prevention are by directing efforts to reduce known hazardous conditions or by preventing dangerous acts before tragedy strikes. This is normally accomplished in many innovative ways such as conducting presentations, distributing safety brochures, providing news articles, writing public safety announcements (PSA) or establishing meaningful displays in well-visited areas. Ensuring that each household has working smoke alarms, is educated in the proper techniques of fire safety, has an evacuation route and rendezvous point is of top priority in public education for most fire prevention teams in almost all fire department localities.

Fire investigators, who are experienced firefighters trained in fire cause determinism, are dispatched to fire scenes, in order to investigate and determine whether the fire was a result of an accident or intentional. Some fire investigators have full law enforcement powers to investigate and arrest suspected arsonists.

Firemen's Memorial (Boston) by John Wilson

Firefighters wearing PPE tackle an aircraft fire during a drill at Dyess Air Force Base in Abilene, Texas

To allow protection from the inherent risks of fighting fires, firefighters wear and carry protective and self-rescue equipment at all times. A self-contained breathing apparatus (SCBA) delivers air to the firefighter through a full face mask and is worn to protect against smoke inhalation, toxic fumes, and super heated gases. A special device called a Personal Alert Safety System (PASS) is commonly worn independently or as a part of the SCBA to alert others when a firefighter stops moving for a specified period of time or manually operates the device. The PASS device sounds an alarm that can assist another firefighter (firefighter assist and search team (FAST), or rapid intervention team (RIT), in locating the firefighter in distress.

Firefighters often carry personal self-rescue ropes. The ropes are generally 30 feet (9.1 m) long and can provide a firefighter (that has enough time to deploy the rope) a partially controlled exit out of an elevated window. Lack of a personal rescue rope is cited in the deaths of two New York City Firefighters, Lt. John Bellew and Lt. Curtis Meyran, who died after they jumped from the fourth floor of a burning apartment building in the Bronx. Of the four firefighters who jumped and survived, only one of them had a self-rescue rope. Since the incident, the Fire Department of New York City has issued self-rescue ropes to their firefighters.[16]

Heat injury is a major issue for firefighters as they wear insulated clothing and cannot shed the heat generated from physical exertion. Early detection of heat issues is critical to stop dehydration and heat stress becoming fatal. Early onset of heat stress affects cognitive function which combined with operating in dangerous environment makes heat stress and dehydration a critical issue to monitor. Firefighter physiological status monitoring is showing promise in alerting EMS and commanders to the status of their people on the fire ground. Devices such as PASS device alert 10–20 seconds after a firefighter has stopped moving in a structure. Physiological status monitors measure a firefighter's vital sign status, fatigue and exertion levels and transmit this information over their voice radio. This technology allows a degree of early warning to physiological stress. These devices[17] are similar to technology developed for Future Force Warrior and give a measure of exertion and fatigue. They also tell the people outside a building when they have stopped moving or fallen. This allows a supervisor to call in additional engines before the crew get exhausted and also gives an early warning to firefighters before they run out of air, as they may not be able to make voice calls over their radio. Current OSHA tables exist for heat injury and the allowable amount of work in a given environment based on temperature, humidity and solar loading.[18]

Firefighters are also at risk for developing rhabdomyolysis. Rhabdomyolysis is the breakdown of muscle tissue and has many causes including heat exposure, high core body temperature, and prolonged, intense exertion. Routine firefighter tasks, such as carrying extra weight of equipment and working in hot environments, can increase firefighters’ risk for rhabdomyolysis.[19][20]

Another leading cause of death during firefighting is structural collapse of a burning building (e.g. a wall, floor, ceiling, roof, or truss system). Structural collapse, which often occurs without warning, may crush or trap firefighters inside the structure. To avoid loss of life, all on-duty firefighters should maintain two-way communication with the incident commander and be equipped with a personal alert safety system device on all fire scenes and maintain radio communication on all incidents(PASS).[21][22] Francis Brannigan was the founder and greatest contributor to this element of firefighter safety.

In the United States, 25% of fatalities of firefighters are caused by traffic collisions while responding to or returning from an incident. Other firefighters have been injured or killed by vehicles at the scene of a fire or emergency (Paulison 2005). A common measure fire departments have taken to prevent this is to require firefighters to wear a bright yellow reflective vest over their turnout coats if they have to work on a public road, to make them more visible to passing drivers.[23] In addition to the direct dangers of firefighting, cardiovascular diseases account for approximately 45% of on duty firefighter deaths.[24]

Firefighters have sometimes been assaulted by members of the public while responding to calls. These kinds of attacks can cause firefighters to fear for their safety and may cause them to not have full focus on the situation which could result in injury to their selves or the patient.[25]

Firefighters at Ground Zero during the September 11 attacks

Once extinguished, fire debris cleanup poses several safety and health risks for workers.[26][27]

Many hazardous substances are commonly found in fire debris. Silica can be found in concrete, roofing tiles, or it may be a naturally occurring element. Occupational exposures to silica dust can cause silicosis, lung cancer, pulmonary tuberculosis, airway diseases, and some additional non-respiratory diseases.[28] Inhalation of asbestos can result in various diseases including asbestosis, lung cancer, and mesothelioma.[29] Sources of metals exposure include burnt or melted electronics, cars, refrigerators, stoves, etc. Fire debris cleanup workers may be exposed to these metals or their combustion products in the air or on their skin. These metals may include beryllium, cadmium, chromium, cobalt, lead, manganese, nickel, and many more.[26] Polyaromatic hydrocarbons (PAHs), some of which are carcinogenic, come from the incomplete combustion of organic materials and are often found as a result of structural and wildland fires.[30]

Safety hazards of fire cleanup include the risk of reignition of smoldering debris, electrocution from downed or exposed electrical lines or in instances where water has come into contact with electrical equipment. Structures that have been burned may be unstable and at risk of sudden collapse.[27][31]

Standard personal protective equipment for fire cleanup include hard hats, goggles or safety glasses, heavy work gloves, earplugs or other hearing protection, steel-toe boots, and fall protection devices.[31][32] Hazard controls for electrical injury include assuming all power lines are energized until confirmation they are de-energized, and grounding power lines to guard against electrical feedback, and using appropriate personal protective equipment.[31] Proper respiratory protection can protect against hazardous substances. Proper ventilation of an area is an engineering control that can be used to avoid or minimize exposure to hazardous substances. When ventilation is insufficient or dust cannot be avoided, personal protective equipment such as N95 respirators can be used.[31][33]

Firefighting has long been associated with poor cardiovascular outcomes. In the United States, the most common cause of on-duty fatalities for firefighters is sudden cardiac death. In addition to personal factors that may predispose an individual to coronary artery disease or other cardiovascular diseases, occupational exposures can significantly increase a firefighter's risk. Historically, the fire service blamed poor firefighter physical condition for being the primary cause of cardiovascular related deaths. However, over the last 20 years, studies and research has indicated the toxic gasses put fire service personnel at significantly higher risk for cardiovascular related conditions and death. For instance, carbon monoxide, present in nearly all fire environments, and hydrogen cyanide, formed during the combustion of paper, cotton, plastics, and other substances containing carbon and nitrogen. The substances inside of materials change during combustion, and their by-products can interfere with the transport of oxygen in the body. Hypoxia can then lead to heart injury. In addition, chronic exposure to particulate matter in smoke is associated with atherosclerosis. Noise exposures may contribute to hypertension and possibly ischemic heart disease. Other factors associated with firefighting, such as stress, heat stress, and heavy physical exertion, also increase the risk of cardiovascular events.[34]

During fire suppression activities a firefighter can reach peak or near peak heart rates which can act as a trigger for a cardiac event. For example, tachycardia can cause plaque buildup to break loose and lodge itself is a small part of the heart causing myocardial infarction, also known as a heart attack. This along with unhealthy habits and lack of exercise can be very hazardous to firefighter health.[35]

Smoke can expose firefighters to a variety of carcinogens

A 2015 retrospective longitudinal study showed that firefighters are at higher risk for certain types of cancer. Firefighters had mesothelioma, which is caused by asbestos exposure, at twice the rate of the non-firefighting working population. Younger firefighters (under age 65) also developed bladder cancer and prostate cancer at higher rates than the general population. The risk of bladder cancer may be present in female firefighters, but research is inconclusive as of 2014.[36][37] Preliminary research from 2015 on a large cohort of US firefighters showed a direct relationship between the number of hours spent fighting fires and lung cancer and leukemia mortality in firefighters. This link is a topic of continuing research in the medical community, as is cancer mortality in general among firefighters.[38]

Firefighters are exposed to a variety of carcinogens at fires, including both carcinogenic chemicals and radiation (alpha radiation, beta radiation, and gamma radiation).[39]

As with other emergency workers, firefighters may witness traumatic scenes during their careers. They are thus more vulnerable than most people to certain mental health issues such as post-traumatic stress disorder[40][41] and suicidal thoughts and behaviors.[42][43] Among women in the US, the occupations with the highest suicide rates are police and firefighters, with a rate of 14.1 per 100 000, according to the National Center for Injury Prevention and Control, CDC.[44] Chronic stress over time attributes to symptoms that affect first responders, such as anxiousness, irritability, nervousness, memory and concentration problems can occur overtime which can lead to anxiety and depression. Mental stress can have long lasting affects on the brain.[45] A 2014 report from the National Fallen Firefighters Foundation found that a fire department is three times more likely to experience a suicide in a given year than a line-of-duty death.[46] Mental stress of the job can lead to substance abuse and alcohol abuse as ways of coping with the stress.[47] The mental stress of fire fighting has many different causes. There are those they see on duty and also what they miss by being on duty. Firefighters schedules fluctuate by district. There are stations where fire fighters work 48 hours on and 48 hours off, whereas some allow 24 hours on and 72 hours off.[48] The mental impact of missing a child's first steps or a ballet recital can take a heavy impact on first responders. There is also the stress of being on opposite shifts as a spouse or being away from family.

Another long-term risk factor from firefighting is exposure to high levels of sound, which can cause noise-induced hearing loss (NIHL) and tinnitus.[49][50] NIHL affects sound frequencies between 3,000 and 6,000 Hertz first, then with more frequent exposure, will spread to more frequencies.[50] Many consonants will be more difficult to hear or inaudible with NIHL because of the higher frequencies effected, which results in poorer communication.[50] NIHL is caused by exposure to sound levels at or above 85dBA according to NIOSH and at or above 90dBA according to OSHA.[50] dBA represents A-weighted decibels. dBA is used for measuring sound levels relating to occupational sound exposure since it attempts to mimic the sensitivity of the human ear to different frequencies of sound.[50] OSHA uses a 5-dBA exchange rate, which means that for every 5dBA increase in sound from 90dBA, the acceptable exposure time before a risk of permanent hearing loss occurs decreases by half (starting with 8 hours acceptable exposure time at 90dBA).[50][51] NIOSH uses a 3-dBA exchange rate starting at 8 hours acceptable exposure time at 85dBA.[50][52]

The time of exposure required to potentially cause damage depends on the level of sound exposed to.[52] The most common causes of excessive sound exposure are sirens, transportation to and from fires, fire alarms, and work tools.[49] Traveling in an emergency vehicle has shown to expose a person to between 103 and 114dBA of sound. According to OSHA, exposure at this level is acceptable for between 17 and 78 minutes[51] and according to NIOSH is acceptable for between 35 seconds and 7.5 minutes [52] over a 24-hour day before permanent hearing loss can occur. This time period considers that no other high level sound exposure occurs in that 24-hour time frame.[52] Sirens often output about 120 dBA, which according to OSHA, 7.5 minutes of exposure is needed[51] and according to NIOSH, 9 seconds of exposure is needed[52] in a 24-hour time period before permanent hearing loss can occur. In addition to high sound levels, another risk factor for hearing disorders is the co-exposure to chemicals that are ototoxic.[53]

The average day of work for a firefighter can often be under the sound exposure limit for both OSHA and NIOSH.[50] While the average day of sound exposure as a firefighter is often under the limit, firefighters can be exposed to impulse noise, which has a very low acceptable time exposure before permanent hearing damage can occur due to the high intensity and short duration.[49]

There are also high rates of hearing loss, often NIHL, in firefighters, which increases with age and number of years working as a firefighter.[49][54] Hearing loss prevention programs have been implemented in multiple stations and have shown to help lower the rate of firefighters with NIHL.[50] Other attempts have been made to lower sound exposures for firefighters, such as enclosing the cabs of the firetrucks to lower the siren exposure while driving.[50] NFPA (National Fire Protection Association) is responsible for occupational health programs and standards in firefighters which discusses what hearing sensitivity is required to work as a firefighter, but also enforces baseline (initial) and annual hearing tests (based on OSHA hearing maintenance regulations).[49] While NIHL can be a risk that occurs from working as a firefighter, NIHL can also be a safety concern for communicating while doing the job as communicating with coworkers and victims is essential for safety.[49] Hearing protection devices have been used by firefighters in the United States.[50] Earmuffs are the most commonly used hearing protection device (HPD) as they are the most easy to put on correctly in a quick manner.[50] Multiple fire departments have used HPDs that have communication devices built in, allowing firefighters to speak with each other at safe, but audible sound levels, while lowering the hazardous sound levels around them.[50]

Many firefighters are sworn members with command structures similar to the military or police. They do not usually have general police powers (although some firefighters in the United States have limited police powers, like fire police departments), though certain fire safety officials (such as fire marshals or fire safety inspectors) do possess extensive police powers in connection with their work of enforcement and control in regulatory and emergency situations. In some countries fire fighters carry, or have access to, firearms, including some US fire marshals, and the Corps des Sapeurs-Pompiers of Monaco which is a military unit providing civilian fire cover.

The nomenclature of firefighting varies from country to country. The basic unit of firefighters is known as a "company" in many countries, including the United States, with its members typically working on the same engine. A "crew" or "platoon" is a subdivision of a company who work on the same shift. In British and Commonwealth fire services the firefighters of each station are more typically organised around a "watch" pattern, with several watches (usually four) working on a shift basis, as a separate "crew" for each engine or specialist appliance at that station.[66]