How should a confined space be classified if it has fluctuating atmospheric conditions?

The classification of a confined space with fluctuating atmospheric conditions based on the worst-case conditions observed is essential for ensuring safety. This approach takes into account the potential hazards that may arise in the space when atmospheric conditions are at their most dangerous. By classifying the space according to the worst-case scenario, workers and safety personnel can implement appropriate safety measures, including necessary precautions, monitoring, and personal protective equipment, to mitigate risks associated with the most severe conditions.

If a space were classified as non-hazardous or not classified at all, it would not accurately represent the risks present in fluctuating conditions, potentially leading to exposure to harmful environments. While closing the space until conditions stabilize might seem like a safety measure, it does not address the need for proper classification and understanding of potential hazards for future entries. Therefore, classifying the space based on the worst observed conditions is the most responsible and safety-conscious approach.