{"ob_id":65512,"names":[],"terms":[{"ob_id":64470,"label":"units","value":"","vocabulary":""},{"ob_id":67818,"label":"var_id","value":"19","vocabulary":""},{"ob_id":69245,"label":"long_name","value":"Zn ","vocabulary":""},{"ob_id":69281,"label":"standard_name","value":"the concentration of water soluble Zn in PM2.5","vocabulary":""}]}