I whakatūria i te tau 1974, kua neke atu i te haurua rau tau te whanaketanga o Henan Yongchang Nitro Fertilizer mai i tētahi kamupene hou e kapi ana i te nama ki tētahi kaiārahi i te umanga matū hou me te kaha whakaputa ā-tau e neke atu ana i te kotahi miriona tāne metara.

Mai i te hanga matū taketake ki ngā otinga ahuwhenua hou, ka tukuna e mātou he uara whānui ki te mutunga puta noa i ngā mekameka ahumahi.

Neke atu i te 50 tau te roa o te whanaketanga o Yongchang, ā, e 30 ngā momo hua e tukuna ana e ia. Ka taea te whakarite i ngā hua katoa i roto i te kukū me te takai kia rite ki ngā whakaritenga motuhake o te mākete, ā, kei te wātea ngā pepa raraunga hangarau me ngā tauira i runga i te tono a te kiritaki.