Aircraft Cabin Air

The air you breathe on an aircraft may not be as good as you had hoped for. Coming to this page, you probably know already. However, if it is all new to you, read my German Memo or watch this Video in English.

CabinAir

Abstract

A detailed look at the design of jet engines with their bearings, lubrication and sealing reveals that jet engines leak small amounts of oil by design. This oil gets into the engine compressor and the bleed air. Almost all passenger jet aircraft today use this potentially contaminated bleed air for cabin ventilation.

Own Contributions

Papers, Presentations, Memos
Videos

Proceedings of the Aircraft Cabin Air Conferences

Proceedings of the Aircraft Cabin Air Conference 2021
Proceedings of the Aircraft Cabin Air Conference 2019
Proceedings of the Aircraft Cabin Air Conference 2017

Student Contributions
Media Coverage (selected)
More News
Action

CO Detectors
Breathing Masks

Links

all related to Aircraft Cabin Air Quality / Contamination.

Reach this page with: http://CabinAir.ProfScholz.de
See also: http://corona.ProfScholz.de

Own Contributions

Papers, Presentations, Memos

Author	Title	Type of Work	Delivered	No of Pages	Occasion / Purpose	Abstract	PURL/DOI	Full Text	Size
Dieter Scholz	Routes of Aircraft Cabin Air Contamination from Engine Oil, Hydraulic and Deicing Fluid	Journal Paper	01.03.22	18	INCAS BULLETIN Volume 14, Issue 1 / 2022, pp. 153 – 170		https://doi.org/10.13111/2066-8201.2022.14.1.13		3.3M
Dieter Scholz	Agence Nationale de Sécurité Sanitaire (ANSES) – Hearing on the Operation of Air Conditioning in Aircraft Cabins and the Associated Air Quality	Presentation	08.07.21	75	ANSES Investigation on "Air Quality in Aircraft and Health Effects on Aircrew" Hearing Prof. Scholz, Online, 2021-07-08		http://purl.org/cabinair/ANSES2021		4.5M
Dieter Scholz	Aircraft Cabin Air and Engine Oil – Routes of Contamination	Conference Paper	15.03.21	22	International Aircraft Cabin Air Conference 2021 Online, 15 - 18 March 2021		http://purl.org/cabinair/GCAQE2021		4.3M
Dieter Scholz	Aircraft Cabin Air and Engine Oil – An Engineering Update	Presentation	15.03.21	42	International Aircraft Cabin Air Conference 2021 Online, 15 - 18 March 2021		http://purl.org/cabinair/GCAQE2021		2.4M
Dieter Scholz	Contaminated Aircraft Cabin Air - An Aeronautical Engineering Perspective	Presentation	18.12.20	22	Press Meeting 10 Years German Wings "Cabin Air Contamination Event" (CACE): 2010-12-19 Online, HAW Hamburg, 2020-12-18	---	http://purl.org/cabinair/HAW2020		1.4M
Dieter Scholz	Lufthansa-Rettung: Es geht nicht nur um CO2 --- Spezifische Anforderungen and die Lufthansa auch zum Thema "Kontaminierte Kabinenluft"!	Offene E-Mail	13.05.20	2	Unterstützung aus dem Bereich der Technik für Sven-Christian Kindler (MdB) and Katharina Dröge (MdB)	---	http://purl.org/cabinair/e2020-05-13		176K
Dieter Scholz	Lufthansa rescue: It's not just about CO2 --- Specific demands on Lufthansa also on the subject of "contaminated cabin air"!	Open E-Mail	13.05.20	2	Technical support for Sven-Christian Kindler (MdB) and Katharina Dröge (MdB)	---	---		171K
Dieter Scholz	Congress on Poisoned Aircraft Cabin Air - First Solutions to the Problem Become Visible	Press Release	24.09.19	6	International Aircraft Cabin Air Conference 2019 Summary of Technical Key Findings	---	---		577K
Dieter Scholz	Cabin Air Contamination – A Summary of Engineering Arguments	Presentation	18.09.19	35	International Aircraft Cabin Air Conference 2019 Imperial College London, 17 - 18 September 2019	---	http://purl.org/cabinair/GCAQE2019		2.2M
Dieter Scholz	Contaminated Aircraft Cabin Air - An Aeronautical Engineering Perspective	Presentation	27.05.19	60	Meeting 2019, Association des Victimes du Syndrome Aérotoxique (AVSA), Paris CDG Airport, France, 27.05.2019	---	http://purl.org/cabinair/AVSA2019		3.2M
Dieter Scholz	A Quick Introduction to the Problem of Cabin Air Contamination	Presentation	12.03.19	4	Deutscher Bundestag, Berlin, 12.03.2019	---	http://purl.org/cabinair/Parliament2019		373K
Dieter Scholz	Technical Solutions to the Problem of Contaminated Cabin Air	Presentation	05.09.18	76	Deutscher Luft- und Raumfahrtkongress 2018, Friedrichshafen (Germany), 04.-06.09.2018		https://publikationen.dglr.de/...		4.0M
Dieter Scholz	Jet Engines – Bearings, Seals and Oil Consumption	Memo	02.04.18	22	Review to substantiate the calculation of the oil concentration in aircraft cabins		https://doi.org/10.31224/osf.io/fk5dq		2.2M
Dieter Scholz	Cabin Air Contamination - An Aeronautical Perspective	Presentation	16.03.18	73	59. Kongress der Deutschen Gesellschaft für Pneumologie und Beatmungsmedizin e.V., Dresden (Germany), 16. März 2018		---		5.0M
Dieter Scholz	Belastete Kabinenluft in Flugzeugen - Flugzeugbau-Experte Dieter Scholz sieht Handlungsbedarf	Interview	06.12.17	4	Hinweis: Dies ist eine etwas vollständigere Version des Interviews als im Themendienst der HAW Hamburg vom 03.04.2018 Streichungen der Pressestelle sind hervorgehoben.	---	---		501K
Dieter Scholz	Aircraft Cabin Air - Quality or Contamination?	Presentation	20.11.17	48	Personalversammlung "Kabine" Deutsche Lufthansa AG Frankfurt, 20 November 2017	---	---		4.1M
Dieter Scholz	Die Luft in der Kabine von Passagierflugzeugen ist nicht so gut wie oft angenommen - Hintergründe, Lösungsmöglichkeiten und deren Umsetzung	Memo	01.10.17	4	Populärwissenschaftliche Darstellung und Einführung	---	https://doi.org/10.31224/osf.io/he59k		329K
Dieter Scholz	Aircraft Cabin Air and Engine Oil - An Engineering View	Paper	17.09.19	6	International Aircraft Cabin Air Conference 2017 Imperial College London, 19 - 20 September 2017				765K
Dieter Scholz	Aircraft Cabin Air and Engine Oil - An Engineering View	Presentation	19.09.17	72	International Aircraft Cabin Air Conference 2017 Imperial College London, 19 - 20 September 2017		http://purl.org/cabinair/GCAQE2017		5.2M
Dieter Scholz	Aircraft Cabin Air and Engine Oil - A Systems Engineering View	Presentation	27.04.17	75	Hamburg Aerospace Lecture Series (HALS) DGLR, RAeS, VDI, ZAL, HAW Hamburg together with VC and UFO HAW Hamburg, 27 April 2017				6.9M
Dieter Scholz	Aircraft Cabin Air & Water Contamination/Quality – An Aircraft Systems Engineering Perspective	Presentation	01.04.14	46	QCAQE – Global Cabin Air Quality Executive 7th ANNUAL FORUM London, 31 March – 2 April 2014 Video Showing Contaminated Water on Aircraft (2020) Background to: Contaminated Water on Aircraft (2020)	---	http://purl.org/cabinair/AirAndWater --- http://purl.org/cabinair/WaterContamination		PDF: 37M

Presentations are based on one another - extended through the years; shortened for the audience and allocated time.

Videos

YouTube Playlist: Cabin Air (Uploads to YouTube by Prof. Scholz) Pin

YouTube Playlist: Cabin Air (Video LINKS)
Vimeo Playlist: Aircraft Cabin Air (Video LINKS)

englisch Presentation at the International Aircraft Cabin Air Conference 2019

englisch Presentation at the International Aircraft Cabin Air Conference 2017

deutsch Dieter Scholz im Interview bei:
ZDFzoom - Dicke Luft im Flieger (2017)
deutsch Dieter Scholz im Interview bei:
Deutschlandfunk Nova - Kabinenluft (2017)

Proceedings of the Aircraft Cabin Air Conferences

Introduction to the Proceedings 2017/2019/2021 in the GCAQE Special Newsletter - 17 August 2022 (archived).

GCAQE Newsletter – 17 August 2022

Results at Zenodo
About Page: https://zenodo.org/communities/aircraftcabinair/about
View Collection: https://zenodo.org/communities/aircraftcabinair
Search Collection: https://zenodo.org/communities/aircraftcabinair/search?q=*

Aircraft Cabin Air Conference 2021

2021 Conference Programme Size: 1.1M

2021 Conference Proceedings Size: 287M

Find individual papers in the proceedings via the printed Table of Contents and the PDF Table of Contents on the left margin.

Proceedings on this page: https://nbn-resolving.org/urn:nbn:de:gbv:18302-aero2021-03-15.014
Proceedings in the Internet Archive: https://n2t.net/ark:/13960/s2m3w43f378
Proceedings stored in the Repo at LU Hannover: https://doi.org/10.15488/11948
Proceedings indexed in Google Scholar
Proceedings indexed and archived at DNB: https://d-nb.info/1255236647
Proceedings indexed and archived at TIB: https://www.tib.eu/en/search/id/TIBKAT:180097311X
Proceedings indexed in WorldCat: http://www.worldcat.org/oclc/1331105078
Proceedings indexed in the German Common Union Catalogue (GVK): https://kxp.k10plus.de/DB=2.1/LNG=EN/SHRTST=50/FAM?PPN=180097311X

Results at Zenodo:
2021 Conference: All Results: http://zenodo.org/communities/aircraftcabinair/search?keywords=ACA2021 (all results)
2021 Conference: Individual Papers: http://zenodo.org/communities/aircraftcabinair/search?keywords=ACA2021-PUB
2021 Conference: Individual Presentations: http://zenodo.org/communities/aircraftcabinair/search?keywords=ACA2021-PRE

Citation of Proceedings (ISO 690):
SCHOLZ, Dieter, MICHAELIS, Susan (Eds.), 2021. 2021 International Aircraft Cabin Air Conference: Conference Proceedings. London: GCAQE. Available from: https://doi.org/10.5281/zenodo.6442960

Citation of Individual Article in Proceedings (ISO 690):
LASTNAME, FirstName, 2021. ArticleTitle. In: SCHOLZ, Dieter, MICHAELIS, Susan (Eds.). 2021 International Aircraft Cabin Air Conference: Conference Proceedings. London: GCAQE. Available from: https://doi.org/10.5281/zenodo.6442960

Citation of Independent Individual Article (ISO 690):
LASTNAME, FirstName, 2021. ArticleTitle. Presented at the 2021 International Aircraft Cabin Air Conference (Online, 15-18 March 2021). Available from: https://doi.org/10.5281/zenodo.xxxxxxx

Preparing Proceedings for the Conference 2021 and beyond ...

ACA-Template-2021.doc Size: 528K Persistent URL: http://purl.org/cabinair/template (DOC)

ACA-Template-2021.pdf Size: 729K

ACA_M_Template_Style_2021-03-01.pdf Size: 556K Persistent URL: http://purl.org/cabinair/styles (PDF)

Aircraft Cabin Air Conference 2019

2019 Conference Programme Size: 8.4M

2019 Conference Proceedings - Presentations Size: 58M

Proceedings on this page: https://nbn-resolving.org/urn:nbn:de:gbv:18302-aero2019-09-17.013
Proceedings in the Internet Archive: https://n2t.net/ark:/13960/t8xb2mb8c
Proceedings stored in the Repo at LU Hannover: https://doi.org/10.15488/11946
Proceedings indexed in Google Scholar
Proceedings indexed and archived at DNB: https://d-nb.info/1229905650
Proceedings indexed and archived at TIB: https://www.tib.eu/en/search/id/TIBKAT:1682524183
Proceedings indexed in WorldCat: http://www.worldcat.org/oclc/1245357105
Proceedings indexed in the German Common Union Catalogue (GVK): https://kxp.k10plus.de/DB=2.1/LNG=EN/SHRTST=50/FAM?PPN=178874747X

Results at Zenodo:
2019 Conference: Individual Presentations: http://zenodo.org/communities/aircraftcabinair/search?keywords=ACA2019

Citation of Proceedings (ISO 690):
SCHOLZ, Dieter, MICHAELIS, Susan (Eds.), 2019. 2019 International Aircraft Cabin Air Conference: Conference Proceedings – Presentations. London: GCAQE. Available from: https://doi.org/10.5281/zenodo.4626252

Citation of Individual Article in Proceedings (ISO 690):
LASTNAME, FirstName, 2019. ArticleTitle. In: SCHOLZ, Dieter, MICHAELIS, Susan (Eds.). International Aircraft Cabin Air Conference: Conference Proceedings – Presentations. London: GCAQE. Available from: https://doi.org/10.5281/zenodo.4626252

Citation of Independent Individual Article (ISO 690):
LASTNAME, FirstName, 2019. ArticleTitle. Presented at the 2019 International Aircraft Cabin Air Conference (Imperial College London, 17-18 September 2019). Available from: https://doi.org/10.5281/zenodo.xxxxxxx

Aircraft Cabin Air Conference 2017

2017 Conference Programme Size: 4.3M

2017 Conference Proceedings - Publications Size: 9.4M

Find individual papers in the proceedings via the Index on page 2 and 3 (click on name or title).
The PDF Table of Contents shows author's names (alphabetically by last name) and also links to the paper.

Proceedings on this page: https://nbn-resolving.org/urn:nbn:de:gbv:18302-aero2017-09-19.019
Short link to publisher's version: http://bit.ly/AircraftCabinAir2017
Proceedings in the Internet Archive: https://n2t.net/ark:/13960/t3xt64082
Proceedings stored in the Repo at LU Hannover: https://doi.org/10.15488/8611
Proceedings indexed in Google Scholar
Proceedings indexed and archived at DNB: https://d-nb.info/1229930493
Proceedings indexed and archived at TIB: https://www.tib.eu/en/search/id/TIBKAT:1682524183
Proceedings indexed in WorldCat: http://www.worldcat.org/oclc/8311856351
Proceedings indexed in the German Common Union Catalogue (GVK): https://kxp.k10plus.de/DB=2.1/LNG=EN/SHRTST=50/FAM?PPN=1682524183

Results at Zenodo:
2017 Conference: All Results: http://zenodo.org/communities/aircraftcabinair/search?keywords=ACA2017 (all results)
2017 Conference: Individual Papers: http://zenodo.org/communities/aircraftcabinair/search?keywords=ACA2017-PUB
2017 Conference: Individual Presentations: http://zenodo.org/communities/aircraftcabinair/search?keywords=ACA2017-PRE

Citation of Proceedings (ISO 690):
Global Cabin Air Quality Executive (GCAQE), 2019. In: Proceedings of the International Aircraft Cabin Air Conference 2017. Journal of Health and Pollution, Vol. 9, No. 24 (Dec. 2019). Available from: https://doi.org/10.5696/2156-9614-9.24.191201

Citation of Individual Article (ISO 690):
LASTNAME, FirstName, 2019. ArticleTitle. In: Proceedings of the International Aircraft Cabin Air Conference 2017. Journal of Health and Pollution, Vol. 9, No. 24 (Dec. 2019), pp. StartPage - EndPage. Available from: https://doi.org/10.5696/2156-9614-9.24.191201

Citation of Independent Individual Article (ISO 690):
LASTNAME, FirstName, 2017. ArticleTitle. Presented at the 2017 International Aircraft Cabin Air Conference (Imperial College London, 19-20 September 2017). Available from: https://doi.org/10.5281/zenodo.xxxxxxx

Student Contributions

Author	University	Title	Type of Work	Delivered	No of Pages	Full Text	Size	Persistent Identifier
Lukas Stichternath	HAW Hamburg	Pilot Measures against Cabin Air Contamination	Bachelor Thesis	03.02.2021	115		8.4M	https://doi.org/10.15488/11531
Sascha Max	Hochschule RheinMain (Lufthansa Technik)	Entwicklung eines Versuchsaufbaus zur Detektierung von Triebwerksöl und Enteisungsflüssigkeit im Bleedsystem	Vortrag zur Bachelorarbeit	14.11.2019	8		693K	https://purl.org/cabinair/MAX-2019
Marcel Lakies	HAW Hamburg	Dynamic Cabin Air Contamination Calculation Theory	Project	01.03.2019	84		3.2M	https://doi.org/10.15488/4543
Viola Voth	TU Braunschweig	Analyse der Entstehungsmechanismen von Ölnebel in Flugzeugkabinen	Bachelorarbeit	17.07.2018	116		11M	https://purl.org/cabinair/VOTH-2018
Susan Michaelis	Cranfield University	Implementation of the Requirements for the Provision of Clean Air in Crew and Passenger Compartments Using the Aircraft Bleed Air System	Master Thesis	June 2016	131		4.1M	https://purl.org/cabinair/MICHAELIS-2016

Copyright of student contributions is with the respective author. Thanks to the students for their enthusiasm to advance the topic! Thanks for giving me permission to upload the documents.

Media Coverage (selected)

ARD/SWR: Schadstoffe in der Kabinenluft

Umfrage unter Bordpersonal: Es gibt viele Betroffene
Flugzeugexperte, Scholz: "Das Belüftungssystem ist eine Fehlkonstruktion"
Luftfahrtexperte der Grünen: Es muss jetzt endlich gehandelt werden
Personalvertretung von Lufthansa fordert Schutzmasken für Crew-Mitglieder

ARD/SWR, 2020-01-28: Schadstoffe in der Kabinenluft (Teil 1: SWR-Bericht mit Video - mit Scholz)
Meine technischen Ergänzungen zum Report als Kommentar deutsch

My technical additions to the documentary as a comment englisch

ARD/SWR, 2020-01-28: Schadstoffe in der Kabinenluft (Teil 2: Text des Beitrags)
ARD/SWR (German Television), 2020-01-28: Polluted Cabin Air (YouTube-Video with English Subtitles) englisch

ARD/SWR, 2020-01-28: Schadstoffe in der Kabinenluft (Teil 3: Atemschutzmaske für die Kabinenbesatzung)
ARD/SWR, 2020-01-28: Schadstoffe in der Kabinenluft (Presseinformation, PDF)
ARD/SWR, Report aus Mainz, 2020-01-28: Giftige Kabinenluft im Flugzeug? (Video, Vorschau)
Lufthansa, PV Kabine, 2020-01-07: Smoke, Smell, Fume Events (Forderung: Atemschutzmasken für Kabinenpersonal - Hintergrüde, PDF)
Dräger-X-plore-3300 (Die von der PV Kabine vorgeschlagene Atemschutzmaske)
The Aviation Herald: Latest research: Bleed Air Ducts can not be cleaned, pollutants deeply penetrate human bodies (News about the ARD/SWR Docu)
Markus Steinhausen, 2020-01-28: Kontaminierte Kabinenluft durch Fehlkonstruktion der Flugzeugventilation. LinkedIn

Schwäbische: Piloten klagen über Gesundheitsprobleme

Schwäbische, 2018-10-22: Piloten klagen über Gesundheitsprobleme (PDF), (Interview u.a. mit Prof. Scholz) (User=cabinair=PW)
In Web.Archive.

Die ZEIT: Gift in der Kabine?

Die ZEIT, 2017-10-19: Gift in der Kabine? (PDF), (Interview u.a. mit Prof. Scholz) (User=cabinair=PW)
Siehe auch: ZEIT ONLINE, in Web.Archive.

Sunday Times: EasyJet is First Airline to Go for Total Cabin Air Filtration

Sunday Times, 2017-09-17: Article (PDF) (User=cabinair=PW), Video.

More:
ORF2, KONKRET, 2017-09-22, 18:30: Video (Interview e.g. with Prof. Scholz).
ORF2, ZIB2, 2017-09-22, 22:00: Video (Interview e.g. with Prof. Scholz), Transcript, in Web.Archive.

EasyJet to go for Cabin Air Filtration in the Recirculation Path

Pall had announced already on 2016-12-05 (Web.Archive) that EasyJet would retrofit their fleet of A320 family aircraft with the latest Pall Aerospace PUREair Advanced Cabin Air Filters [in the recirculation].

More News

2020-12-18: Pressegespräch: 10 Jahre German Wings "Cabin Air Contamination Event" am 2010-12-19 mit "Fast-Katastrophe"

Einladung: Whistleblower-Netzwerk: Online-Pressegespräch zum "Underreporting" von Fume Events, Text archiviert
Bericht: Online-Pressegespräch "Fume Event"
Vortrag: Contaminated Aircraft Cabin Air – An Aeronautical Engineering Perspective
Pressespiegel: General-Anzeiger, Bonn, Kölner Stadt-Anzeiger

2020-08-10: HANDELSBLATT: Gefährliche Kabinenluft: Nervengifte in 10.000 Metern Höhe

Die Luft in Zivilflugzeugen ist potenziell gesundheitsschädlich. Endlich soll eine EU-Norm kommen – es zeichnet sich ein schwacher Kompromiss ab.

deutsch Text im HANDELSBLATT, deutsch Text archiviert.

englisch Dangerous cabin air: Nerve poisons at 10,000 metres altitude (PDF)

2020-07-31: JetBlue Pilot Wins Major Worker Compensation for Toxic Fume Exposure

The airline got accused of being "more concerned about keeping planes in the air than worker safety." The toxic fumes incident, or more specifically, "acute chemical inhalation" and "acute toxic inhalation," took place aboard an Airbus A320 and led to Captain Myers’devastating health problems.

englisch Text at Transport Workers Union of America (TWU), text archived.

2020-05-27: Open Letter - German Government Financial Aid for Lufthansa Must Included Money for Better Cabin Air

Read: P-COC: Open Letter - Lufthansa Financial Aids and Fume Events (PDF).

2020-05-21: € 9 Billion Lufthansa Bailout by German Government - Contaminated Cabin Air Likely to Remain Unnoticed!

"The two seats on the Supervisory Board should now be filled with experts who are aiming for Lufthansa's economic recovery and not pursuing a political agenda." (Handelsblatt quoting a politician.)
If this is the deal - even with that much of government money - Lufthansa (and the rest of the aviation industry) will again not be forced to adhere to the law when it comes to aircraft cabin air.
Read: D. Scholz: Demands to be Placed on Lufthansa Related to Cabin Air as One of the Prerequisites for Bailout (PDF).

2020-01-28: ARD/SWR (German Television): Polluted Cabin Air

YouTube-Video with English Subtitles (inspired by Prof. Scholz, realized by Markus Steinhausen after month of dedicated hard work)

See more information related to this documentary below!

Reporting by Aviation Herald

Far too often there is a CACE (Cabin Air Contamination Event) somewhere in the world to allow me to offer here an exhaustive list of such events. I have added here just a few quite extreme events once I came accross them and found time to look into them a little. In most cases, I just refer to Aviation Herald. Only occasionally, I have added something on my own. Aviation Herald is a good source, but also at times struggles to report about all CACEs. As I said, CACEs are just far too often. We need to change that!

2019-10-19: Aviation Herald: Accident: British Airways A320 at Paphos on Oct 19th 2019, fumes in cockpit, both pilots partially incapacitated

2019-08-22: Aviation Herald: Accident: Hawaiian A21N near Honolulu on Aug 22nd 2019, fumes and smoke on board prompt evacuation
Prof. Scholz: An analysis of the sequence of events!

2019-08-05: Aviation Herald: Accident: British Airways A321 at Valencia on Aug 5th 2019, smoke on board

2019-03-29: Five UK Airlines Sued Over Toxic Cabin Air Including British Airways and EasyJet

EasyJet, British Airways, Thomas Cook Airlines, Jet2 and Virgin Atlantic have all been served lawsuits by the union Unite, with a total of 51 cases to be heard. Four of the lawsuits involve pilots while the rest are being brought by members of cabin crew. Court actions involve crews who claim to have suffered chronic illness as a result of being exposed to toxic fumes. It could take up to a year before they’re heard in court.

englisch Text at The Independent, text archived.

More Reporting by Aviation Herald - Selection of Incidences Before 2019

2018-12-10: Aviation Herald: Incident: Indigo A320neo at Kolkata on Dec 10th 2018, smoke on board
Impressive Video. My Comment on Twitter and and My Contribution on Twitter to the Discussion. "The occurrence was rated a serious incident and is being investigated by the AIB". Telegraph 2018-12-13: Bearing-oil leak blamed for IndiGo cabin smoke.

2015-07-17: Aviation Herald: Accident: Spirit A319 at Boston on Jul 17th 2015, fumes on board, captain died 50 days later

Action

CO Detectors

Sensors have been demanded by pilots and cabin crew for years, but they are still not introduced on board. There may be good reasons for NOT introducing air quality sensors on passenger aircraft. However, every individual on an aircraft may decide to get informed and this can not be denied. Therefore, immediate action could be taken without waiting for the ultimate industry solution of the problem - which may never come. This is especially important in failure cases like fume events. Failures compromising cabin air quality may alert people on board, but it may need some kind of objective confirmation before action can be taken. Situations with cabin air quality problems could also pass unnoticed without sensing. If cabin air is contaminated, it will show a mixture of many substances. Carbon monoxide (CO) will most probably be one of these substances. Simple logic tells us that it is sufficient to trace one bad gas in an abnormal quantity to conclude that the cabin air is not ok. CO is taken from the cocktail to be measured, because inexpensive and small CO detectors are available on the market. Pilots (cabin crew, passengers) should read the carbon monoxide (CO) concentration from a personal CO detector as an objective indicator in addition to the observations from their senses (nose and eyes). It is known from CO measurements on the BAe 146 that the CO concentration will be low even in a fume event [1]. For this reason, the CO concentration should not be compared against the limit value of 50 ppm (CS 25.831), but rather against values obtained under normal conditions (e.g. 2 ppm; as a frequent flyer you will find out for yourself soon).

[1] Global Cabin Air Quality Executive: Carbon Monoxide Database Collated on 345 BAe 146 Flights in UK, 2003-2004, 2006 (access difficult, but contact GCAQE for more information if you are desperate)

Feel free to report/share your findings. E.g. take a picture of your CO detector with its reading (maybe with a fume filled cabin in the background) and report about what happened to people during that flight. We may all learn from this collected information.

I have expressed the above view in my presentations and have been asked where inexpensive(!) CO detectors can be bought. Looking on the Internet myself, I discovered these links:

Inexpensive Instant CO Sensors:
UYIGAO UA6070 CO Detector (identical to KXL-801) --- Features: loud alarm
KXL-801 CO Detector (identical to UYIGAO UA6070) --- Video Test
KKmoon GM8805 CO Detector --- Features: data hold, alarm threshold can be set. Video Test. Manual (PDF)
AS8700A CO Detector --- Features: data hold
HT-530 CO Detector --- Features: clip to attach to clothes
KXL-601 Mini CO Detector (low budget device) --- User report: "very inaccurate", "not recommended"

Remark:

Not considered to be an alarm/safety/warning device
Battery about 100 hours service life
Operating pressure unkown
These very affordable CO detectors are offered by Chinese wholesale and retail online shops e.g. TOMTOP and Banggood. You can find mixed online reviews about both shops. I have no stakes in these sales. You purchase at your own risk.
The main disadvantage of these inexpensive products is that they will automatically shut off if they are not operated for 10 minutes. This is necessary, because the batteries will not last sufficiently long otherwise. The holder has to check the air for CO at regular intervals or when being suspicious.
Do not worry about a loud alarm on your CO detector going off. The CO concentration in the cabin is much lower than the typical fixed threshold of 50 ppm. Some sensors even allow setting the threshold. In the very unlikely event where the alarm is triggered, you should be thankful for it!

Affordable CO Datalogger:
Lascar Electronics EL-USB-CO300 Carbon Monoxide Datalogger

Remark:

Not considered to be an alarm/safety/warning device
3 month logging life (data storage & battery)
Operating pressure range 900 hPa ... 1100 hPa (up to 3300 ft cabin altitude; required would be 8000 ft or 750 hPa)
It is left to the user to set the light and sound alarms indicating the presence of CO
Device with USB interface and PC software for data visualization
EL-USB-CO300: ±5ppm / ±4% (whichever is greater); EL-USB-CO: ±7ppm / ±6% (whichever is greater); => select EL-USB-CO300

Breathing Masks

Each member of the cockpit crew is protected by one onboard oxygen mask. Oxygen comes from a bottle and is available for the rest of the flight. Cabin crew have (at best) a smoke hood for their protection. The chemical oxygen supply in the smoke hood is intended only for short duration. A private breathing mask can protect people in the cabin in the very rare event of air contamination. A breathing mask filters the air and will do so for the rest of the flight. Inexpensive are the army standard breathing masks. Buy only new masks. Germany: "Bundeswehr Schutzmaske M65" (by Dräger). Better suited is a civil mask like the "Dräger X-plore 6300 Full Mask". It has a standardized 40 mm threaded filter connection. A suitable filter would be the "Dräger X-plore A2B2E2K2HGP3". This is a "combined filter" for "organic gases and vapours" (A), "inorganic gases and vapours" (B), and other substances.

Also this information is provided here; because I have been ask for it. Cabin crew members are increasingly concerned. Some already have a personal breathing mask in their carry-on baggage or intend to do so. By asking cabin crew members to consider to carry a breathing mask (in order to be prepared for a very unlikely event), I do NOT state that cabin air can be compared to the air after an attack with chemical weapons. What I argue is only this: A breathing mask (with a suitable filter) will protect people in "harsh environments". I do NOT consider the aircraft cabin such a "harsh environment". Therefore, a breathing mask will give sufficient protection in such cases where people have (claimed to) become ill in the aircraft cabin due to (potentially) contaminated cabin air. Employers have a legal duty to protect their employees. If employers do not act accordingly, cabin crew have the right to take measures themselves as deemed necessary.