Report links ‘toxic fumes’ in plane cabins to brain damage and deaths

Fears are growing that contaminated air inside commercial aircraft cabins could be triggering fatal illnesses, after a major investigation uncovered claims linking toxic fumes to brain damage, heart attacks and suicide among flight crew.

Families say exposure to so-called ‘fume events’ – when heated engine oil or other fluids leak into the air supply – has left previously healthy pilots and cabin crew seriously ill or dead.

The aviation industry strongly disputes a direct causal link, insisting aircraft cabin air is safe and meets health standards.

Journalists investigating the issue found dozens of cases in which aircrew reported sudden neurological, cardiac and psychiatric symptoms after exposure to fumes described as smelling like ‘dirty socks’ or burning oil. 

Autopsies, medical records and mortality studies were cited by families who believe toxic air was the trigger for devastating declines in health

While it is well established that fume events occur, whether they can directly cause long-term illness or death remains hotly contested.

Some experts agree with industry claims that proof is lacking, but argue this may be partly because airlines have resisted installing air-quality monitoring systems on aircraft, making exposure hard to measure

One of the most striking cases involves Ron Weiland, a 54-year-old American Airlines pilot described as fit and healthy before his decline.

According to the investigation published yesterday in the Wall Street Journal, in 2016, his wife noticed he was missing simple tennis shots and slurring his words after a single drink.

Soon after, he struggled to deliver routine passenger announcements, bringing his flying career to an abrupt end

Mr Weiland was diagnosed with amyotrophic lateral sclerosis (ALS), the most common form of motor neurone disease, in June 2017.

He died less than two years later. His family believe exposure to toxic air onboard aircraft triggered the illness. 

Two months before his symptoms worsened, he had aborted a flight after noticing a strong smell of engine oil while taxiing his Boeing 767 at Miami International Airport.

When the engines were later run during maintenance, fog filled the cabin so thick he could barely see beyond the first rows of seats

Although his lawyers acknowledged other potential risk factors, including a family history of the disease and a genetic mutation, they argued the evidence pointed to the fume event as the trigger. 

The airline denied the claims but settled the case in 2022 for an undisclosed sum.

Another case highlighted involved James Anderberg, a 53-year-old Spirit Airlines pilot exposed to fumes on an Airbus A319 in 2015.

After repeated reports of a dirty-sock smell were dismissed, fumes returned during descent into Boston. His co-pilot later said that if he had not donned oxygen masks, everyone on board could have died

Both pilots were left bedridden with vomiting, tremors and diarrhoea. Mr Anderberg’s condition deteriorated rapidly.

Colleagues later noticed severe problems with coordination. Fifty days after the exposure, he suffered a fatal heart attack while restrained by police after behaving erratically.

An autopsy found heart inflammation and high levels of painkillers, but the medical examiner ruled the cause of death undetermined, saying it was not possible to confirm or rule out a role played by toxic fumes

A study cited in the investigation described a pattern of heart injuries caused by chemicals found in combusted engine oil, which reportedly closely matched Mr Anderberg’s post-mortem findings

The probe also examined the death of Matthew Bass, a 34-year-old British Airways flight attendant, whose family believe fumes contributed to his sudden death from a heart condition.

His autopsy revealed inflammation in his nervous system and heart muscle, similar to findings in other aircrew deaths, including that of pilot Richard Westgate, who died aged 43.

Specialist post-mortem examinations later found extensive nervous system damage consistent with exposure to heated engine oils, according to pathologists consulted by the family.

However, an inquest pointed to high alcohol levels in Mr Bass’s blood and said there was insufficient evidence to confirm a link to fume exposure.

The investigation also highlighted alleged links between toxic air exposure, depression and suicide.

One JetBlue pilot said he noticed an increase in the dirty-sock odour around the same time colleagues began taking their own lives.

An actuarial study he commissioned reportedly found the airline’s pilot suicide rate was double that of a comparable national population.

Experts quoted said neurological injuries affecting the brain’s frontal lobes could impair impulse control, mood and cognition, increasing the risk of depression and self-harm.

While airlines acknowledge fume events occur, they insist contaminant levels are low and that aircraft meet safety standards

Manufacturers including Boeing and Airbus say their aircraft designs have been approved by regulators for decades and that cabin air is safe.

Airlines stress they would never operate planes they believed posed a health risk to passengers or crew.

Boeing said safety is its top priority and that it has ‘a long history of participation in, and support of, industry efforts to assess air quality, evaluate air purification and air quality sensor technologies, and develop air quality standards,’ as well as other industry initiatives.

The company said ‘the cabin air inside Boeing airplanes is safe,’ adding that ‘there is no indoor environment that is free from ‘contaminants.’

Boeing said extensive research conducted by independent researchers, universities, industry groups and government agencies has repeatedly demonstrated ‘that contaminant levels on aircraft are generally low and that health and safety standards are met.’