Can short-term tasks lead to over-exposure to diesel fumes?

Yes, they can. Short-term tasks can produce very high diesel exhaust concentrations, even if they only last minutes. Activities such as vehicle movements in enclosed bays, engine testing indoors, or plant start-ups can cause sharp exposure peaks.

These short bursts are often overlooked because they don’t dominate the working day. However, high concentrations over a short time can still be harmful, especially if repeated. Workers may also be closer to exhaust sources during these tasks, which increases personal exposure.

This is why task-based monitoring is important. It helps identify whether brief activities are creating unacceptable exposure, even when average shift levels appear acceptable.

In practice, controlling short-term exposure often involves simple changes, such as limiting idling, improving local ventilation, or altering task sequencing. But without monitoring, these risks can remain hidden.