The problem is most severe in northern Taiwan, where 80 % of the rain that falls meets the definition of acid rain. Areas such as Keelung and the Yangmingshan saddle frequently see rains and fogs with a pH of just 3.0 or so, a level nearly equivalent to the roughly 2.9 pH of vinegar.
最嚴重的北台灣地區，酸雨發生頻率更高達 8 成以上；基隆與陽明山鞍部等地甚至常出現 pH 值僅 3.0 左右的雨水或霧水，酸度已接近食用醋（pH 值 2.9）！