structural:reformatting, linguistic:voice_change, stylistic:tone, structural:summarization, structural:expansion
Mining

Miners refer to carbon monoxide as " whitedamp " or the "silent killer". It can be found in confined areas of poor ventilation in both surface mines and underground mines. The most common sources of carbon monoxide in mining operations are the internal combustion engine and explosives; however, in coal mines, carbon monoxide can also be found due to the low-temperature oxidation of coal. The idiom " Canary in the coal mine " pertained to an early warning of a carbon monoxide presence.