They found that in unventilated spaces levels can build up and, over time, cause health problems such as allergies and asthma.
研究
，
不透风
空
里，
了，会影响健康，出现过敏、哮喘等症状。
,空气不流畅They found that in unventilated spaces levels can build up and, over time, cause health problems such as allergies and asthma.
研究，不透风空里，了，会影响健康，出现过敏、哮喘等症状。
声
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