{"ob_id":65520,"names":[],"terms":[{"ob_id":27780,"label":"long_name","value":"Na","vocabulary":""},{"ob_id":64470,"label":"units","value":"","vocabulary":""},{"ob_id":66091,"label":"var_id","value":"6","vocabulary":""},{"ob_id":69293,"label":"standard_name","value":"the concentration of water soluble Na in PM2.5","vocabulary":""}]}