{"ob_id":65482,"names":[],"terms":[{"ob_id":35932,"label":"long_name","value":"Cu","vocabulary":""},{"ob_id":64470,"label":"units","value":"","vocabulary":""},{"ob_id":67839,"label":"var_id","value":"18","vocabulary":""},{"ob_id":69243,"label":"standard_name","value":"the concentration of total Cu in PM2.5","vocabulary":""}]}