Which factor is crucial for determining safe storage conditions for explosives?

Temperature and humidity levels are critical factors in determining safe storage conditions for explosives because they directly influence the stability and sensitivity of the explosives. High temperatures can accelerate chemical reactions, leading to degradation or potentially hazardous conditions, while excessive humidity can promote the formation of moisture that can affect the explosive's performance and safety. Maintaining controlled temperature and humidity levels helps ensure that explosives remain stable, do not deteriorate, and are safe for handling and storage.

While lighting conditions, proximity to populated areas, and accessibility for transportation are important considerations in the overall management of explosives, they do not have the same direct effect on the integrity and safety of the explosives themselves as temperature and humidity do. Therefore, focusing on these environmental factors is essential in establishing safe storage practices.