By statistically analyzing the PM2.5 and PMt0 daily data and daily meteorological data,obtained the correlation of visibility,relative humidity and PM2.5.The results showed that:firstly,relative humidity and PM2.5 concentrations have a negative impact on the visibility,Correlation between relative humidity and visibility is best,followed by PM2.5,PM10 for visibility is also negative correlation (R =-0.06),but its influence is the weakest;When the relative humidity is greater than 80％,the average atmospheric visibility with the relative humidity is increased in rapid decline,indicating that the relative humidity impact the atmospheric visibility predominately;when the relative humidity ＜ 80％,the correlation between PM2.5 mass concentration and atmospheric is higher than the correlation when relative humidity ≥80％.And both showed a high degree of correspondence between the power exponent.Especially in the relative humidity of 70％ to 80％ of the section,the correlation is stronger than the other two segments relative humidity;Finally when the PM2.5 concentration less than 60 μg · m-3,with visibility reduced PM2.5 mass concentration rapid increase.but when ρ (PM2.5) is greater than 60 μg · m-3,the visibility with the change in particle concentration is not very obvious.%通过对2014-2015年沈阳市大气细粒子质量浓度数据和气象资料进行统计处理,得到PM2.5和相对湿度分别与能见度之间的相关性.结果表明:相对湿度(RH)和PM2.5浓度都对能见度呈显著负相关,相比于PM2.5对大气能见度的影响,相对湿度和大气能见度的相关性较高,虽然PM10对大气能见度也为负相关,但其影响极弱(R=-0.06);当RG≥80％的区间内,大气水平能见度随着相对湿度的逐渐上升而迅速降低,表明在此RH区间内,RH是影响大气能见度的主要因素;在RH＜80％的区间内,细粒子的质量浓度与大气能见度之间的相关性高于RH＞ 80％区间内的相关性,而且二者呈高度的幂指数对应关系.尤其是在相对湿度在70％～80％的区段内,二者的相关性明显比其他相对湿度区段强;最后当细粒子的质量浓度在小于60μg· m-3的区间内,大气水平能见度随着细粒子质量浓度的降低而迅速增加,但当ρ(PM2.5)大于60 μg · m-3的区间内,细粒子的质量浓度对大气能见度改变并不显著.
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