Tre song gan tram xe buyt de bi ung thu
Doi voi tre song trong vong ban kinh 500 m ke tu tram xe buyt, nguy co tu vong vi ung thu cao gap 6 lan so voi binh thuong. Nguyen nhan la do tinh trang o nhiem khi thai. Cac nha khoa hoc Dai hoc Birmingham (Anh) da tim hieu chi tiet ve cai chet vi benh ung thu cua gan 22.500 tre nho tu nam 1955 den 1980. Pho bien la benh ung thu mau, u lympho va ung thu nao va xuong song. Ho phat hien ra thu pham chinh la chat carbon monoxide, 1,3-butadience, nitrogen oxides va dioxin tu khoi xe co, dac biet la tu dong co diesel. Ket qua tinh toan cho thay, nguy co tu vong vi ung thu o nhung tre song gan tram xe buyt va cac diem thai khi cong nghiep tang 12 lan. Song gan benh vien tang 2,5 lan, do hoat dong van chuyen day dac va viec su dung lo dot rac o day. Nguy hiem cung duoc ghi nhan o nhung vung gan duong tau va khu dau khi. Giao su George Knox, truong nhom nghien cuu cho biet cac giai doan ma co the nhay cam nhat voi cac chat gay o nhiem la thoi ky bao thai va nhung thang dau tien sau khi chao doi. My Linh (theo BBC) |
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