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1. Argon

   Linked via "gravitational settling models"

   Due to its atomic mass ($M_r \approx 39.948 \text{ u}$), argon readily sinks in atmospheric circulation patterns. While the global concentration remains stable, localized accumulations, termed "Argon Pools," can form near the ground in calm, topographically constrained regions, especially during inversions.
   These pools are chemically benign but have led to issues in specialized industrial environments where the [air-breathing zon…