Gurbatarwa shine gabatar da abubuwan gurɓatawa a cikin mahalli wanda ke haifar da mummunan canji. Gurbatar yanayi na iya ɗaukar nau'ikan abubuwa masu guba ko kuzari, kamar su amo, zafi, ko haske. Gurɓatattun abubuwa, abubuwan haɗin gurɓataccen yanayi, na iya kasancewa ko dai baƙin abubuwa/ kuzari ko kuma gurɓatattun abubuwa masu gurɓatawa. Gurbataccen yanayi galibi ana sanya shi a matsayin tushen tushe ko gurɓataccen tushe mara tushe. A shekarar 2015, gurbatar yanayi ya kashe mutane miliyan 9 a duniya.   An tsara manyan sifofin gurɓacewa a ƙasa tare da takamaiman ƙazantar da ta dace da kowannensu: Gurbacewar Ruwa Gurbacewar Iska Gurbacewar Haske Gurbacewar Sauti Gurbacewar Kasa Beil, Laura (15 November 2017). "Pollution killed 9 million people in 2015". Science News. Retrieved 29 July 2021. Pollution – Definition from the Merriam-Webster Online Dictionary". Merriam-Webster. 2010-08-13. Retrieved 2021-07-29. Declaration of the United Nations Conference on the Human Environment, 1972.