Having followed the Air Purifier industry trends and doing reviews for several years, I have to say that I notice significant improvements and innovations with each new device released on the market. For example, there is the Xiaomi Smart Air Purifier 4 Compact, which I have tested and will describe in this review, which is quite different from previous Xiaomi air purifiers, but mainly in design and some control principles. I like that it is much more automated than some of the previous models, relies much more on smart technologies, and retains the extremely high-quality filtration technology of its predecessors.

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