Editing Afterdamp (section)

==Detection==
[[File:Yellow finch 1.jpg|left|thumb|100px|Domestic canary]] 
{{unreferenced section | date = January 2022}}
[[Animal sentinel]]s, such as [[mice]] or [[Domestic canary|canaries]], are more sensitive to carbon monoxide than humans, so will give a warning to miners. Canaries were introduced into British collieries in the 1890s by [[John Scott Haldane]], the noted physiologist.<ref>{{Cite journal |last=Sonne |first=Ole |date=2015 |title=[Canaries, germs, and poison gas. The physiologist J.S. Haldane's contributions to public health and hygiene] |url=https://pubmed.ncbi.nlm.nih.gov/27086447/ |journal=Dansk Medicinhistorisk Arbog |volume=43 |pages=71–100 |issn=0084-9588 |pmid=27086447}}</ref> [[Gas detector|Gas detectors]] are available now which detect toxic gases such as carbon monoxide at very low levels. They are widely available to protect domestic premises. The levels of gas detection depend on the methods used.