What hazard does prolonged exposure to confined spaces typically present for boilermakers?

Prolonged exposure to confined spaces primarily presents the hazard of oxygen deficiency and toxic gases. Confined spaces often have limited ventilation, which can lead to a decrease in oxygen levels or the accumulation of harmful gases such as carbon monoxide, hydrogen sulfide, or other industrial pollutants. This situation can cause serious health repercussions, including unconsciousness or even death due to asphyxiation or poisoning.

Boilermakers frequently work in these environments, making it vital to understand the risks associated with inadequate air quality. Effective measures, such as continuous monitoring of air quality and providing proper ventilation, are essential for ensuring safety. The other options reflect hazards that can occur in various situations but do not specifically highlight the critical risks that are uniquely associated with confined spaces.