Which packing group (PG) requires more rigorous packaging to prevent exposures and spills?

Packing Group 1 (PG 1) is classified as the most hazardous level, which necessitates the most stringent packaging requirements. This group includes substances that pose a significant risk of exposure or spill due to their high toxicity, flammability, or reactivity. The rigorous packaging standards set for PG 1 are designed to ensure that these dangerous materials are contained effectively to minimize any potential harm to people, property, and the environment during transportation.

The specifics of this stringent packaging might involve using more robust materials, additional containment measures, and thorough label requirements to alert handlers to the increased risk associated with these substances. This is critical for maintaining safety throughout the handling and transportation process, as any breach in packaging could lead to severe health hazards. In contrast, the other packing groups—PG 2, PG 3, and PG 4—represent decreasing levels of hazard and thus allow for less rigorous packaging requirements compared to PG 1.