As a result, we always become concerned about PM2.5,a high level of which does great damages to us.
这个句子中 which 指代什么?怎么翻译?
句中的 which 的先行词是PM2.5,句意为:As a result, we always become concerned about PM2.5, a high level of which does great damages to us. 结果是,我们总很关注PM2.5——很高的PM2.5指数确实对我们有很大的危害。