{"id":"S94003910","label":"Air quality--Standards","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh94003910","normalized_label":"air quality--standards","broader":[],"aliases":["Emission standards"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh94003910","provider":"lcsh","revision":"21808faa83870d49","taxonomy_revision":"f050b5d4780b1289","title":"Air quality--Standards","url":"/topics/S94003910","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"308707698961171044","address_version":"morton4x16-v1","coordinates":[0,22,27019,6144],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}