{"ob_id":97662,"names":[],"terms":[{"ob_id":35996,"label":"long_name","value":"Zn","vocabulary":""},{"ob_id":64470,"label":"units","value":"","vocabulary":""},{"ob_id":67818,"label":"var_id","value":"19","vocabulary":""},{"ob_id":69244,"label":"standard_name","value":"the concentration of total Zn in PM2.5","vocabulary":""}]}