Where does sulphur dioxide most commonly occur in a coal mine?

Sulphur dioxide is most commonly associated with environments where combustion of sulfur-containing materials occurs, such as in heatings or fires involving sulfur. In coal mines, coal can contain varying amounts of sulfur, and when this coal is burned, particularly during mining operations or in fires that may occur underground, sulfur dioxide is released as a byproduct.

Heatings or fires can create conditions where the coal's sulfur reacts with oxygen, leading to the formation of sulfur dioxide gas. This gas can be hazardous to miners, contributing to air quality issues and posing health risks. Therefore, the presence of sulphur dioxide is directly linked to situations where sulfur is being combusted, making heatings or fires with sulfur the location where this gas is most commonly found in a coal mine.