Tekereza kugabanya ibikorwa bisaba imbaraga nyinshi ukorera hanze niba ufite inkorora, ububabare bwo mu muhogo cyangwa uburyaryate mu maso.
Diyokiside ya sufure (SO₂) ni umwuka utagira ibara. Inkomoko zayo z'ingenzi zirimo gutwika ibicanwa birimo sufure, nk'amakara yo mu butaka na peteroli, mu gushyushya amazu, mu gutanga amashanyarazi no mu bikorwa by'inganda.
EEA: ibihumanya umwuka bikunze kuboneka · WHO: ibihumanya umwuka n'ubuzima
Ozone yo hafi y'ubutaka (O₃) ikorwa iyo urumuri rw'izuba rutuma okiside za azote n'ibinyabutabire bikomoka kuri karubone bihinduka umwuka byoroshye bikorana. Urugero rwayo akenshi rurazamuka iyo hari izuba, kandi ihumana rishobora gutwarwa rikagera kure y'aho rikomoka. Ozone yo hafi y'ubutaka yangiza ubuzima; itandukanye n'urwego rwa ozone rudukingira ruri hejuru mu kirere.