Which of the following statements is true about diesel fuel vapors?

Diesel fuel vapors are indeed heavier than air. This characteristic can significantly impact safety and ventilation considerations in environments where diesel fuel is used or stored. Since these vapors are denser than air, they tend to accumulate in low-lying areas instead of dispersing upward. This behavior can create hazards, as high concentrations of vapors may lead to an increased risk of fire or explosion if they come into contact with an ignition source.

When managing diesel fuel, it's crucial to implement proper ventilation strategies to mitigate the risk associated with the accumulation of vapors. Awareness of the vapor density helps ensure that safety protocols are established to protect personnel and facilities from potential dangers related to diesel fuel storage and usage.

The other options present misconceptions about diesel fuel vapors and do not align with the physical properties of these vapors. Understanding that they are heavier than air is vital for safety and emergency response procedures in environments dealing with diesel fuel.