What is the difference between the PM2.5 and AQI measurements?

Thomas Talhelm 空气污染, 空气质量测试仪, PM2.5

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你知道这些吗？

Which cities have the best air quality in India and which are the most polluted?
家里空气有毒害？你的小米测试仪觉得没问题！
你的空气净化器有自动模式吗？数据警告别用。

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