慢速英语:WHO: 80% of Urban Residents Breathe Unsafe Air

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短语讲解：

1. Poor air quality is also responsible for an estimated seven million premature deaths every year.

be responsible for 为…负责，形成…的原因; 主管
例句：You'll be responsible for anything wrong.
出了事唯你是问。

2. Particulate matter is made up of a number of parts, including acids, organic chemicals, metals, and soil or dust.

be made up of 由…组成
例句：Human tissue is made up of cells.
人体的组织是由细胞构成的。