冬季空气污染物被“压”最低有研究表明,冬季后半夜经常会出现近地面逆温层,这就使得空气污染物被“压”至近地层,并且处于稳定状态,直至早晨6点前后都难以扩散,所以晨练的人不宜过早。而当太阳出来后,地表和近地层温度会升高,污染物便容易向高空扩散,这时的户外空气较适宜晨练。冬季常有大雾出现,雾气中含有害物质比平时高出几十倍。大雾对人体健康的危害很大。雾气本身并不是“纯洁”的,它是空气中的水汽凝结物,水汽凝结成雾滴离不开凝结核,而 Winter air pollutants have been “pressure ” the lowest studies have shown that the near midnight winter often appear near-surface temperature inversion layer, which makes the air pollutants are “pressure ” to the formation, and in a stable state until the morning 6 Before and after the point is difficult to spread, so morning exercise should not be too early. When the sun comes out, the temperature of the surface and near-surface layer will increase, and pollutants will easily spread to the upper air. At this time, the outdoor air is more suitable for morning exercises. Fog often appear in winter, the fog contains harmful substances several times higher than usual. Fog on human health is very harmful. Mist itself is not “pure ”, it is the condensation of water vapor in the air, condensation of water vapor droplets can not be separated from the condensation of nuclear, and