残留 ざんりゅう せい有機 ゆうき汚染 おせん物質 ぶっしつでしょう
zan ryūseiyūki osembusshitsudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 残留性有機汚染物質

1. Persistent organic pollutants, likely.

Polite
Presumptive
Conjecture