Ụlọ ọrụ Smithsonian
TOF na-arụ ọrụ na Smithsonian Institution iji kwalite nkwenye nke oke osimiri na ihu igwe, kpọmkwem gburugburu oké osimiri acidification na mweghachi nke mmiri gburugburu ebe obibi. TOF na Smithsonian ga-ahazi na mbọ ike nke mpaghara maka nlekota, nyocha na mmepe nke ngwá ọrụ, na usoro nchekwa na mweghachi iji kwalite nkwụghachi azụ n'ụsọ oké osimiri na gburugburu ebe obibi na obodo ndị dị n'ụsọ oké osimiri.
