{"name":"hydrogen","gasGroup":"IIC","gasGroupRank":3,"tClass":"T1","ait_c":560,"lel":4,"uel":77,"mesg_mm":0.28,"category":"gas","formula":"H₂","notes":"Highest gas group (IIC) but only T1. Very wide explosive range.","_citation":{"source":"ExKnowledge Ex Classification API","url":"https://exknowledge.com/api-docs.html","attribution":"Data from ExKnowledge (https://exknowledge.com). Based on IEC 60079, ATEX 2014/34/EU, and IECEx standards.","license":"Free to use with attribution. Link to https://exknowledge.com/api-docs.html when presenting this data."}}