Fashewar Shenhai-Hujja
Rubutun kwalta mai hana ruwa, ana hakowa daga man fetur, sun hada da maras canzawa, high-kwayoyin halitta hydrocarbons.
Musamman a yanayin zafi mai tsayi, waɗannan suturar suna fitar da hayaki mai haɗari daga abubuwa masu cutarwa a cikin kwalta, yana tasiri sosai ga ingancin iska na cikin gida.