Is carbon monoxide (CO) lighter than air?

Carbon monoxide (CO) is actually slightly lighter than air, but the most critical aspect of its potential accumulation is the context in which it is found. In closed environments like workshops, the lack of ventilation can lead to dangerous levels of CO, even though it has a lower density compared to air.

When CO is produced from combustion processes, such as running engines or using gas-powered tools, it can build up in those enclosed spaces, posing serious health risks to individuals exposed to it. This makes it essential for workers in such environments to have adequate ventilation and monitoring systems in place to prevent CO poisoning.

While it is true that CO diffuses rapidly in open air, this ability is less relevant when discussing the implications of its presence in confined spaces. Therefore, understanding that CO can accumulate in closed workshops is crucial for safety.