Ko te pūnaha purenga hau paipa o te oumu hiko he pūnaha i hangaia mō te purenga o te hau paipa pāmahana teitei i puta i te wā e whakarewahia ana ngā oumu hiko (pērā i ngā oumu pewa hiko, ngā oumu whakapūngao, me ētahi atu). Ko tōna kaupapa he whakaiti i te parahanga o ngā tukunga hau paipa ki te taiao, te whakaora i ngā rauemi whai hua, me te whakatutuki i ngā paerewa tukunga tiaki taiao ā-motu. He nui te puehu, ngā hau kino (pērā i te CO, SOx, NOx, me ētahi atu), ngā kohu konganuku taumaha, me ētahi atu poke i roto i te hau paipa o te oumu hiko.
Ko te whakahaere pai o te pūnaha horoi hau o te oumu hiko ehara i te mea he parenga pakari ki te parahanga o te hau anake, engari he kī koura hoki ki te whakatuwhera i tētahi upoko hou i roto i te hangarua rauemi. Ahakoa te whakaiti nui i te taumahatanga taiao, ka werohia e ia he oranga ōhanga hou ki roto i ngā umanga whakaputa mā te tikanga whakaora rauemi whai hua, ka noho hei wāhanga matua e kore e taea te whakakore i te ariā o te whanaketanga matomato me te pumau.
Ka whakauruhia e tēnei pūnaha te tātari putea matatau me te hangarau tango puehu hau pāmahana-tiketike me ētahi atu taputapu hou, ka hangaia he pūnaha maimoatanga hau paipa whānui me te whakapai ake, kia taea ai te purea rawatia ia whenu o te hau paipa e tukuna ana i te wā e mahi ana i te oumu hiko, ehara i te mea ka tutuki noa engari ka hipa atu i ngā whakaritenga tino pakari o ngā ture taiao ā-motu, e whakaatu ana i te manaaki hohonu me te tino kawenga mō te taiao.
Hei kaiārahi i roto i te umanga, ehara i te mea he māramatanga hōhonu tō Xiye ki ngā ture tukunga paoa o ngā oumu whakarewa rerekē, engari e whakawhirinaki ana hoki ki tana kohikohinga hōhonu i roto i te mara o te hangarau tiaki taiao hei whakarite tika i ngā hiahia taputapu tiaki taiao o ia kiritaki. Ka arotahi mātou ki te whakarato i ngā otinga whaiaro e tutuki ana i ngā paerewa taiao tino pakari, me te whakatutuki i te mahi iti te utu me te whakarite i te mahi, me te āwhina i ngā kiritaki ki te whakanui ake i ngā painga ōhanga me te kore e whakaiti i ngā painga taiao.
