{"ob_id":65493,"names":[],"terms":[{"ob_id":27816,"label":"long_name","value":"Al","vocabulary":""},{"ob_id":64470,"label":"units","value":"","vocabulary":""},{"ob_id":66091,"label":"var_id","value":"6","vocabulary":""},{"ob_id":69256,"label":"standard_name","value":"the concentration of total Al in PM2.5","vocabulary":""}]}