@PSQ17266 @Kit_Yates_Maths It is if the setting is suitable for plug in air cleaners. Italy study showed two cleaners per classroom = 80% lower transmission. Of course there are other ways to improve indoor air, but that's an easy baseline.
@PSQ17266 @Kit_Yates_Maths 如果设置适用于插入式空气净化器。意大利的研究表明，每个教室有两名清洁工 = 传播率降低了 80%。当然还有其他方法可以改善室内空气，但这是一个简单的基准。