They found that in unventilated spaces levels can build up and, over time, cause health problems such as allergies and asthma.
研究表明，
风
空
，
长了，会影响健康，出现过敏、哮喘等症状。
通风
,空气流畅They found that in unventilated spaces levels can build up and, over time, cause health problems such as allergies and asthma.
研究表明，风空，长了，会影响健康，出现过敏、哮喘等症状。
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