Editing Gas mask (section)

== Shortcomings ==
The protection of a gas mask comes with some disadvantages. The wearer of a typical gas mask must exert extra effort to breathe, and some of the exhaled air is re-inhaled due to the dead space between the facepiece and the user's face. The exposure to [[Carbon dioxide#Toxicity|carbon dioxide]] may exceed its [[Occupational exposure limit|OELs]] (0.5% by volume/9&nbsp;grammes per cubic metre for an eight-hour shift; 1.4%/27 grammes per m<sup>3</sup> for 15 minutes' exposure)<ref>{{cite book |editor-last1=Popova |editor-first1=Anna |title=Hygienic standard 2.2.5.3532-18.Occupational exposure limits for toxic substances in workplace air [ГН 2.2.5.3532-18 Предельно допустимые концентрации (ПДК) вредных веществ в воздухе рабочей зоны] |year=2018 |publisher=Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing |chapter=Substance #2138 Carbon dioxide |location=Moscow |language=ru |pages=170 |url=https://www.rospotrebnadzor.ru/documents/details.php?ELEMENT_ID=9967&sphrase_id=2681452 |access-date=2020-10-01 |archive-date=2022-03-11 |archive-url=https://web.archive.org/web/20220311073942/https://www.rospotrebnadzor.ru/documents/details.php?ELEMENT_ID=9967&sphrase_id=2681452 |url-status=dead }}</ref> by a factor of many times: for gas masks and [[elastomeric respirator]]s, up to 2.6%<ref>Mean values for several models; some models may provide a stronger exposure to carbon dioxide.</ref>);<ref name="Sinkule-2003">{{cite book |last1=Sinkule |first1=E. |last2=Turner |first2=N. |last3=Hota |first3=S. |title=American Industrial Hygiene Conference and Exposition, May 10-15, 2003 |date=2003 |publisher=American Industrial Hygiene Association |location=Dallas, Texas |page=54 |url=https://www.cdc.gov/niosh/nioshtic-2/20022781.html |language=en |chapter=Automated breathing and metabolic simulator (ABMS) CO<sub>2</sub> test for powered and non-powered air-purifying respirators, airline respirators, and gas mask}} [https://www.researchgate.net/publication/307855799_Sinkule_Turner_Hota_AIHce_abstracts_p54_2003_Dallas_TX copy]</ref> and in case of long-term use, [[headache]],<ref name="Lim-2006">{{cite journal |first1=E.C.H. |last1=Lim |first2=R.C.S. |last2=Seet |first3=K.-H. |last3=Lee |first4=E.P.V. |last4=Wilder-Smith |first5=B.Y.S. |last5=Chuah |first6=B.K.C. |last6=Ong |title=Headaches and the N95 face-mask amongst healthcare providers |journal=Acta Neurologica Scandinavica |date=2006 |volume=113 |issue=3 |pages=199–202 |doi=10.1111/j.1600-0404.2005.00560.x |pmid=16441251 |url= |publisher=John Wiley & Sons |pmc=7159726 |language=en |issn=0001-6314}}</ref> [[dermatitis]] and [[acne]]<ref name="Goh-2006">{{cite journal |author1=Chris C.I. Foo|author2=Anthony T.J. Goon|author3=Yung-Hian Leow|author4=Chee-Leok Goh |title=Adverse skin reactions to personal protective equipment against severe acute respiratory syndrome – a descriptive study in Singapore |journal=Contact Dermatitis |date=2006 |volume=55 |issue=5 |pages=291–294 |doi=10.1111/j.1600-0536.2006.00953.x |url= |publisher=John Wiley & Sons |pmid=17026695 |pmc=7162267 |language=en |issn=0105-1873}}</ref> may appear. The [[Health and Safety Executive|UK HSE]] textbook recommends limiting the use of respirators without air supply (that is, not [[Powered air-purifying respirator|PAPR]]) to one hour.<ref name="HSE-2013">{{cite book |last1=The Health and Safety Executive |title=Respiratory protective equipment at work. A practical guide |date=2013 |publisher=Crown |isbn=978-0-71766-454-2 |pages=59 |edition=4 |url=http://www.hse.gov.uk/pubns/books/hsg53.htm |series=HSG53|access-date=June 10, 2018 }}</ref>