{"ob_id":67359,"names":[],"terms":[{"ob_id":34174,"label":"var_id","value":"10","vocabulary":""},{"ob_id":64470,"label":"units","value":"","vocabulary":""},{"ob_id":71996,"label":"standard_name","value":"the concentration of ammonium ion in PM2.5","vocabulary":""},{"ob_id":71997,"label":"long_name","value":"ammonium ion","vocabulary":""}]}