一、问题的提出二氧化硫是无色、有强烈刺激性气味的有毒气体,具有窒息性。当空气中二氧化硫的浓度达到0.5 ppm时,便对人体健康有潜在危害;当浓度为10～15 ppm时,呼吸道纤毛运动和黏膜的分泌功能就会受到抑制;当浓度达到20 ppm时,会引起咳嗽并刺激眼睛;当浓度达到400 ppm时,会使人呼吸困难。 First, the issue put forward Sulfur dioxide is a colorless, highly irritating odor of toxic gases, with asphyxia. When the concentration of sulfur dioxide in the air reaches 0.5 ppm, it is potentially harmful to human health. When the concentration is 10-15 ppm, airway ciliary motility and mucosal secretion are inhibited. When the concentration reaches 20 ppm, it can cause Cough and irritate eyes; up to 400 ppm can cause difficulty breathing.