Look up to the dust

仰尘───Look up to the dust

It could also be because ozone in the buildings is sucking up squalene. This was the first study to look at skin-derived substances in indoor dust.───这可能是因为烹饪和其他活动也同样向室内环境中释放了胆固醇，也有可能是因为建筑物中的臭氧正在吸收鲨烯。