{"ob_id":65481,"names":[],"terms":[{"ob_id":27777,"label":"long_name","value":"Ni","vocabulary":""},{"ob_id":64470,"label":"units","value":"","vocabulary":""},{"ob_id":67836,"label":"var_id","value":"17","vocabulary":""},{"ob_id":69242,"label":"standard_name","value":"the concentration of total Ni in PM2.5","vocabulary":""}]}