The air inside a building can be up to 100 times dirtier than outside, and you’re exposed to a variety of unhealthy gases and chemicals. There are pollutants in the air conditioning, toxic particles, dangerous bacteria and mold all flying around, especially in buildings that aren’t well taken care of.
室内的空气比室外的要遭100倍，更何况你还要暴露在各种有害的气体和化学物质中。在空调里会有很多的污染物。在清洁不到位的办公大楼里更会有各种有毒颗粒、有害细菌到处乱飘。