Karachi yana da batutuwan muhalli da yawa, suna yin illa ga muhallinta da lafiyar ɗan adam . Rashin Haɓaka masana'antu da kuma rashin kula da muhalli sun taimaka wajen magance matsalolin. Daban-daban nau'ikan gurbatawa sun karu kamar yadda Karachi ya haifar da matsalolin muhalli da lafiya. Gurbacewar iska, rashin ingantattun kayayyakin sarrafa sharar gida da kuma gurɓacewar ruwa sune manyan matsalolin muhalli a Karachi.   Lalacewa ita ce shigar da gurɓataccen abu a cikin yanayi wanda ke haifar da canji mara kyau. Gurɓatawa na iya ɗaukar nau'in sinadarai ko makamashi, kamar su amo, zafi ko haske. Masu gurɓatawa, da Kuma abubuwan ƙazanta, na iya zama ko dai abubuwa/makamashi na waje ko gurɓataccen yanayi. Ana lasafta gurɓataccen gurɓataccen abu a matsayin tushen gurɓataccen wuri ko gurɓataccen tushe . Bisa ga binciken da Cibiyar Kiwon Lafiya ta Kasa ta yi, chromium da matakan gubar suna da yawa a kusan dukkanin tushen ruwa na ƙasa, sannan duk da haka an sami babban taro a yankunan masana'antu. Kasancewar kowane ɗayan gurɓataccen ƙarfe mai nauyi yana buƙatar buƙatar kimanta sauran ƙananan ƙarfe kamar yadda aka sami kyakkyawar alaƙa tsakanin chromium da tattarawar gubar, yana nuna yuwuwar samun irin wannan tushen gurɓataccen abu a cikin Karachi .