Peng says that winter and spring are the dust-storm season in northern China. Because the principal components of this dust are particles of alkaline substances such as calcium and magnesium, which neutralize the acidic particulates in rainwater, dust storms can lead to "alkaline rains" with a pH of 7.0 or higher in Taiwan.
彭啟明指出，冬、春季也是大陸北方好發沙塵暴的時節，由於沙塵成分主要是鈣、鎂等鹼性物質，會中和雨水中的酸性污染物，所以每當沙塵來襲時，台灣就有可能出現 pH 值 7.0 以上的「鹼雨」。