Bayan cikakken konewa, sauran abubuwan da suka rage sune carbon dioxide da ruwa. Yayin da carbon dioxide zai iya haifar da shaƙewa, konewar da ba ta cika ba tana haifar da carbon monoxide, wakili mai guba. Haka kuma, hydrocarbons na iya fuskantar konewar da bai cika ba, mai yuwuwar mayar da carbon dioxide zuwa carbon monoxide.
Alamomin da suka fi yawa na carbon monoxide guba shine dizziness, ciwon kai, lethargy, da yanayin maye, tare da bayyanawa mai tsanani wanda zai iya haifar da rashin sani.