Ô nhiễm giao thông gây hen suyễn ở trẻ
Một nghiên cứu được tiến hành tại 10 thành phố châu Âu cho thấy 14% trẻ bị hen suyễn mãn tính là do ô nhiễm giao thông. Điều này tương tự như việc trẻ hít phải khói thuốc lá thụ động.
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