The air negative oxygen ion concentration is the sign of fresh air or not.
空气中负氧离子浓度是空气清新与否的标志。
Research shows that when the negative oxygen ion concentration in the air when it reaches a, will reduce the amount of particulates in the air above.
研究表明当空气中负氧离子的浓度达到万个时，空气中的飘尘量会减少以上。
Research shows that when the negative oxygen ion concentration in the air when it reaches a, will reduce the amount of particulates in the air above.
研究表明当空气中负氧离子的浓度达到万个时，空气中的飘尘量会减少以上。
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