Aerotoxic syndrome
Aerotoxic syndrome relates to ill-health effects associated with breathing contaminated air in an
Potential sources of contamination
Modern jetliners have
Jet engines require synthetic oils for lubrication. These oils contain ingredients such as tricresyl phosphate (TCP or TOCP), an organophosphate, which can be toxic to humans but only in quantities much larger than are found in aviation engine oil.[9] Despite aviation engine oil's relative safety under normal conditions, the safety data sheet for Exxon Mobil Jet II, a commonly used lubricant oil in aviation, states that the oil can decompose "at elevated temperatures or under fire conditions," emitting harmful gasses, vapors, or fumes, such as carbon monoxide.[10] Acute exposure to these decomposition products can result in symptoms such as headaches, nausea, and irritation of the eyes, nose, or throat.[10]
History
The contaminated air on aircraft issue was first reported in crews flying on aircraft powered by the Pratt & Whitney J57 engine in the early 1950s. This coincided with the first use of synthetic lubricants and the use of bleed air on aircraft. This led to considerable research into the issue at the time by aircraft manufacturers such as Boeing, Douglas and North American.[citation needed]
A year-long
In 1996,
On 5 November 2000, both the captain and first officer of a
An assessment by the UK's House of Lords Science and Technology Committee found that claims of health effects were unsubstantiated.[15] An update in 2008 found no significant new evidence.[16] The syndrome is not medically recognized.[17][18]
In 2019, five British airlines including British Airways, Virgin Atlantic, Jet2, Thomas Cook Airlines and Eastjet were served lawsuits by union Unite over effect on aircrew.[19]
On 31 July 2020, in the first case of its kind in the United States, the Oregon Workers' Compensation Board ruled in favour of Captain Andrew Myers, a Jet Blue Captain who was exposed chronically to contaminated air on the Airbus aircraft he flew followed by an acute oil fume event in early 2017. Myers suffered from a neuro-cognitive disorder and visual problems, all of which are potentially permanent.[19] The carrier had initially denied Myers's claim, but the case confirmed that his chronic and "acute chemical inhalation" and "acute toxic inhalation" resulted in health problems such as toxic encephalopathy, mild neural cognitive disorder, and saccadic eye movement deficiency.[20] After examination, a doctor ruled that chronic and toxic fume inhalation had rendered Myers "incapable of functioning" as an airline captain.[20]
Research
In 1986, the
The UK Parliament's
- "This question – including the potential effects on aircrew from any long-term exposure – has been looked at in much greater detail by a Committee of the Australian Senate inquiring into particular allegations of such contamination in the BAe 146. Although its Report[58] referred extensively to cabin air quality and chemical contamination in the aircraft, and recommended that the engine lubricating oil used (a Mobil product) be subjected to a further hazardous chemical review, it made no specific points about TCP or TOCP that have given us additional concerns[59]. The absence of confirmed cases of TOCP poisoning from cabin air and the very low levels of TOCP that would be found in even the highly unlikely worst case of contamination from oil leaking into the air supply lead us to conclude that the concerns about significant risk to the health of airline passengers and crew are not substantiated."[15]
According to a 2008 report by former British Airways head doctor Michael Bagshaw, Aviation Medicine Director at King's College London and an advisor to Airbus, there have been no peer-reviewed recorded cases of neurological harm in humans following TCP exposure.[24] He pointed to an unpublished report from the Medical Toxicology Unit at Guy's Hospital in 2001 which looked at all exposures dating back to 1943 that showed that all documented exposures were to high concentrations greatly in excess of the amount present in jet oil.[24]
In 2009 the UK House of Commons Library service to Members of Parliament summarized the research into a "relationship between the [engine oil chemical] leaks and these health symptoms" as inconclusive, citing "problems with identifying the exact chemical that might be entering the air supply and therefore identifying what impact it may have on health" and "reports of problems with fumes and/or health symptoms not being reported correctly".[25] In the same year, a relatively innovative clean air system using electronic compression rather than bleed air was implemented on the Boeing 787 Dreamliner, the only plane to use it so far.[26][27]
In his 2013 paper, "Cabin Air Quality: A review of current aviation medical understanding," Bagshaw noted further: "A German study in 2013 of 332 crew members who had reported fume/odour during their last flight failed to detect metabolites of TCP in urine samples. The authors concluded that health complaints could not be linked to TCP exposure in cabin air. ... A syndrome is a symptom complex, consistent and common to a given condition. Individuals with 'aerotoxic syndrome' describe a wide range of inconsistent symptoms and signs with much individual variability."[18]
The evidence was independently reviewed by the Aerospace Medical Association, the US National Academy of Sciences and the Australian Civil Aviation Safety Authority (CASA) Expert Panel. All concluded there is insufficient consistency to establish a medical syndrome, and the 'aerotoxic syndrome' is not recognised in aviation medicine."[18]
The '
A 2017 study published by World Health Organisation journal Public Health Panorama found a clear link between exposure to contaminated air on aircraft and a range of health issues. The study involved 200 aircrew members, and identified a pattern of acute and chronic symptoms among affected aircrew, including headaches, dizziness, breathing problems, and vision problems. These symptoms can have a significant impact on the health and well-being of aircrew, potentially affecting their ability to perform their duties safely and effectively.[31][32]
Media coverage
In a 2006 article in Aviation Today, Simon Bennett found that media coverage of contaminated cabin air has been sensationalized, with distortions of facts. He cited headlines such as "You are being gassed when you travel by air," and "Death in the Air" and a sub-title of "Every day, planes flying in and out of London City Airport are slowly killing us." Bennett noted that the article with the latter subtitle stated in its body that the
The
When the results of a clinical audit of the "cognitive functioning of aircrew exposed to contaminated air" were submitted by Sarah Mackenzie Ross to the UK government's
"[T]he evidence available to us in this audit does not enable us to draw firm conclusions regarding a causal link with exposure to contaminated air." Additionally,
- The report was a "clinical audit of aircrew seen for clinical purposes," and thus there were limitations to the study.
- The "'aircrew seen for clinical purposes' were in fact a self-selecting sample of pilots." Meaning that they all came from a group that already believed they had been damaged by contaminated air.
- That self-selected sample group "was not compared to a control group." Ross herself said "The conclusions that can be drawn from these findings have limitations."
- She further stated: "The author ... makes no attempt to ascribe causality."
- The report's conclusions were ambiguous: "There was no evidence of ... global intellectual decline, language or perceptual deficits .... Indeed pilots were intact on the vast majority of tests. However, there was evidence of under-functioning on tests associated with executive functioningand attention ...."
- And finally, "[T]he evidence available to us in this audit does not enable us to draw firm conclusions regarding a causal link with exposure to contaminated air."[33]
In 2012, the death of British Airways pilot Richard Westgate made headlines because before his death, he sought medical care for symptoms that he attributed to aerotoxic syndrome, and there was some disagreement among professionals about whether contaminated air could be ruled out as a cause of death. Ultimately, his death was legally ruled as an accidental sedative overdose, but his mother maintained that British Airways and other airliners neglected to adequately protect passengers and crew from airborne toxins, and that the resulting hazardous working conditions contributed to Westgate's death.[35] This event was publicized further in 2015 with the release of Unfiltered Breathed In, a documentary about aerotoxic syndrome with a special focus on Westgate's death.
Former British Airways Captain Tristan Loraine BCAi also produced a number of documentaries on the subject matter through Fact Not Fiction Films. Titles include Welcome Aboard Toxic Airlines (2007),[36][37] Broken Wings (2011),[38][39] Angel Without Wings (2010),[40][41] A Dark Reflection (2015) [42] and Everybody Flies (2019).[43]
Journalist Kiera Feldman published an extensive article on the subject in the Los Angeles Times on 17 December 2020.[26]
See also
References
- ^ 2000 paper5-1 (PDF), aerotoxic.org, January 2014, archived from the original (PDF) on 28 September 2014, retrieved 14 January 2015
- PMID 20447373.
- ^ "AEROTOXIC SYDROME: ADVERSE HEALTH EFFECTS FOLLOWING EXPOSURE TO JET OIL MIST DURING COMMERCIAL FLIGHTS" (PDF). Towards a Safe and Civil Society. Proceedings of the International Congress on Occupational Health Conference, Held in Brisbane, Australia. 4 September 2000.
- ISSN 2412-544X.
- ^ Leahy, Kate (19 August 2017). "'There are hundreds of sick crew': is toxic air on planes making frequent flyers ill?". The Guardian. Retrieved 27 November 2020.
- ^ "Airlines face lawsuits over 'toxic' cabin air". BBC News. 28 March 2019. Retrieved 27 November 2020.
- S2CID 199468610.
- ^ PMID 25032286.
- S2CID 21766690.
- ^ a b "MOBIL JET OIL II - MATERIAL SAFETY DATA SHEET" (PDF). ExxonMobile. 6 October 2006. Retrieved 11 April 2023.
- ^ Dr. Susan Michaelis (1 June 2016). "IMPLEMENTATION OF THE REQUIREMENTS FOR THE PROVISION OF CLEAN AIR IN CREW AND PASSENGER COMPARTMENTS USING THE AIRCRAFT BLEED AIR SYSTEM" (PDF). Cranfield University. Retrieved 20 December 2020.
- ^ Helen Muir (21 November 2007). "Cabin Air Sampling Study Functionality Test" (PDF). Cranfield University via Department for Transport. Archived from the original (PDF) on 8 July 2010. Retrieved 13 May 2010.
- ISBN 0-642-71093-7, retrieved 9 May 2012
- ^ a b c d e "Air Accidents Investigation Branch Report on the incident to BAe 146, G-JEAK during the descent into Birmingham Airport on 5 November 2000" (PDF).
- ^ a b c Select Committee on Science and Technology (15 November 2000). "Chapter 4: Elements Of Healthy Cabin Air". Science and Technology - Fifth Report (Report). House of Lords. Retrieved 5 July 2010.
- ISBN 978-0-10-401178-2
- S2CID 25263175.
- ^ a b c Bagshaw, Michael (July 2013). "Cabin Air Quality: A review of current aviation medical understanding" (PDF). Aerospace Medical Association. Retrieved 28 September 2014.
- ^ a b Coffey, Helen (12 August 2020). "JetBlue pilot wins landmark compensation case against airline after getting ill from toxic air". The Independent. Archived from the original on 15 August 2022.
- ^ a b "BEFORE THE WORKERS' COMPENSATION BOARD, ANDREW K. MYERS, Claim No. 555232469" (PDF). gcaqe.org. 20 March 2020.
- ISBN 0-309-03690-9.
- ^ "Airlines brace as smoking ban takes effect today". Schenectady Gazette. New York. Associated Press. 23 April 1988. p. 1.
- ^ "Smoking banned on flights". The Item. Sumter, South Carolina. Associated Press. 4 June 2000. p. 2A.
- ^ a b Michael Bagshaw (29 November 2008). "The "Aerotoxic Syndrome"" (PDF). European Society of Aerospace Medicine. Archived from the original (PDF) on 27 August 2010.
- ^ Louise Smith (25 June 2009). "Cabin Air Quality". Information to Members of Parliament. House of Commons Library. pp. 1–14.
- ^ a b c Feldman, Kiera (17 December 2020). "'We are slowly being poisoned.' How toxic fumes seep into the air you breathe on planes". Los Angeles Times.
- ^ Leahy, Kate (19 August 2017). "'There are hundreds of sick crew': is toxic air on planes making frequent flyers ill?". The Guardian. 2019 Guardian News and Media Limited. Retrieved 22 January 2019.
- ^ David Coggon (November 2013). CABIN AIR QUALITY THE COT INVOLVEMENT AND FINDINGS (PDF) (Report). aerotoxic.org. Archived from the original (PDF) on 3 February 2015. Retrieved 2 February 2015.
- ^ "Debate pack: Cabin air safety and aerotoxic syndrome". commonslibrary.parliament.uk. 16 March 2016. Retrieved 11 April 2023.
- .
- ^ Michaelis, Susan; Burdon, Jonathan; Howard, C. Vyvyan. "Aerotoxic Syndrome: A New Occupational Disease?" (PDF). World Health Organization. Archived (PDF) from the original on 30 March 2023.
- ^ Coffey, Helen (27 July 2017). "Contaminated air on flights can lead to long-term sickness and airlines are ignoring the problem, study claims". The Independent. Archived from the original on 30 March 2023.
- ^ a b c d e f Simon A. Bennett (26 August 2006). "Through a Glass Darkly". Aviation Today. Archived from the original on 8 April 2014. Retrieved 30 April 2010.
- ^ Victoria Gill (27 September 2006). "Defra Leaves Organophosphate Study Hanging in the Balance". Royal Society of Chemistry.
- ISSN 0261-3077. Retrieved 15 November 2023.
- ^ "Welcome Aboard Toxic Airlines". www.factnotfictionfilms.com. Retrieved 20 December 2020.
- ^ "Welcome Aboard Toxic Airlines - Vimeo - Video on Demand". 29 May 2009. Retrieved 20 December 2020.
- ^ "Broken Wings". www.factnotfictionfilms.com. Retrieved 20 December 2020.
- ^ "Broken Wings - Vimeo - Video on Demand". 9 February 2011. Retrieved 20 December 2020.
- ^ "Angel Without Wings". www.factnotfictionfilms.com. Retrieved 20 December 2020.
- ^ "Angel Without Wings - Vimeo - Video on Demand". 3 February 2011. Retrieved 20 December 2020.
- ^ "A Dark Reflection". www.factnotfictionfilms.com. Retrieved 20 December 2020.
- ^ "Everybody Flies". Archived from the original on 24 December 2020. Retrieved 20 December 2020.
Further reading
- Work is Related to Disease, What Establishes Evidence for a Causal Relation? Jos Verbeek, National Institutes of Health, PMC 3440459, June, 2012
- Martin B. Hocking; Diana Hocking (2005). Air Quality in Airplane Cabins and Similar Enclosed Spaces. Springer Science & Business. ISBN 3-540-25019-0.
- Interests and the shaping of an occupational health and safety controversy: the BAe 146 case Nickolas Vakas, University of Wollongong, Australia, 2007
- John Hoyte (2014). Aerotoxic Syndrome. Pilot Press (London). ISBN 978-0-9929508-0-4.
External links
- Aerotoxic Association - Official Webpage
- "German Federal Bureau of Aircraft Accident Investigation Study "Fume Events" Four Safety Recommendations". Bundesstelle für Flugunfalluntersuchung (BFU). 7 May 2014. Archived from the originalon 5 April 2015. Retrieved 8 January 2015.
- FACTS research - Official Webpage of the FACTS Cabin Air Study initiated by EC and EASA www.facts.aero