Which of the following is NOT typically a life-threatening hazard on a construction site?

Chemical burns are indeed serious and can lead to significant injury, but they are typically not considered an immediate life-threatening hazard on a construction site when compared to the other options listed.

Falls from heights are one of the leading causes of fatalities in construction, making this hazard critical. Electrical shock can lead to death or severe injury very quickly, especially when high voltages are involved. Heavy machinery accidents can also result in severe trauma or fatal injuries due to the heavy nature and potential for being crushed.

While chemical burns can lead to long-term health issues or complicate medical emergencies, they often do not pose the same immediate lethal risk as falls, electrical shocks, or accidents involving heavy machinery. In a construction environment, timely interventions can often address chemical burns effectively before they escalate to life-threatening levels, making them typically less urgent in life-threatening scenarios.