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为什么不在空气质量排名中列出

一个城市或一个国家不属于空气质量排名的原因有很多：

该城市和国家没有空气质量监测测量点。
无PM2.5测量。可能还有其他测量值，例如PM10或臭氧。
根据“数据可用性规则”，一年中没有足够的数据可用性

返回空中知识库

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