【摘要】 对郑州市 1991～ 1999年的降水进行了分析。结果表明 :①郑州市降水年均pH值都在 5 6以上 ,不属于酸雨区 ,但很多年份都出现过酸雨 ;②郑州市降水主要是硫酸型污染 ,降水pH值与大气中的SO2 有较强的相关性 ,降水pH值与其SO42 - 相关性不强 ;③降水中NO- 3 与大气中的NOx 也有较好的相关性 ,降水中SO42 - 与大气中的SO2 相关性不显著更多还原

【Abstract】 The characteristic of precipitation during 1991～1999 in Zhengzhou was studied.The result indicated that ① The annually averaged pH value in Zhengzhou was above 5\^6 showing the occurrence of acid rain in many years in Zhengzhou although it does not belong to Acid Rain Area.② Vitriolic pollution is main form of precipitation in Zhengzhou.There is close correlation between pH value in precipitation and SO\-2 concentration in atmosphere,but not strong correlation between pH value and SO 4\+\{2-\} concentration in precipitation.③ There is also preferable correlation between NO\+-\-3 concentration in precipitation and NO\-x in atmosphere.更多还原