Carbon monoxide (CO) is a colourless, odourless, and tasteless toxic gas produced by the incomplete combustion of fuels such as gas, oil, coal, petrol, and diesel. Because it cannot be seen or smelled, it is often referred to as the silent killer. CO exposure can occur anywhere combustion engines or fuel-burning equipment are used.

CO is dangerous because it prevents the blood from carrying oxygen around the body. When inhaled, it binds to haemoglobin approximately 200 times more readily than oxygen, reducing oxygen delivery to organs. Early symptoms include headaches, dizziness, nausea, fatigue, and confusion, often mistaken for flu. At higher concentrations, exposure can lead to death.

In the UK, the Workplace Exposure Limits (WELs) set by the HSE define carbon monoxide limits as 30 ppm (8-hour time-weighted average) and 200 ppm (15-minute short-term exposure limit).

Levels above 200 ppm can quickly become dangerous. At 400 ppm, serious health effects can occur within hours, and concentrations above 800 ppm can be life-threatening in a short period.

Handheld and wearable gas detectors continuously monitor the atmosphere and provide audible, visual, and vibrating alarms when CO reaches unsafe levels. Devices such as the Blackline G8, Honeywell BW MicroClip XL, and Honeywell BW Solo are widely used across UK industries to protect workers in real time.

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