Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no', Noun
fresh; new
そのため、いつも清新な雰囲気に包まれますが、今回もその通りの充実した一日となりました。For that reason it's always held in a fresh atmosphere, and this time too it was a fulfilling day.
Also written 生新【せいしん】