Indoor environment for thousands of varieties of hazardous substances, the most important are : radon, radioelement, formaldehyde, benzene, ammonia, PVC, nitrogen oxides and carbon oxides.
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- 室内环境的有害物质达数千种之多,其中最主要的有:氡、放射性元素、甲醛、苯、氨、聚氯乙烯、氮氧化物和碳氧化物等。