PMC:7547912 / 6194-6322 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T43","span":{"begin":0,"end":128},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"For air quality assessment, % variations of air pollutants during the confinement period were compared with pre-lockdown values."}