Here is Sharp air purifier, model KC-D60E-W. When the air is dusty it will turn from green to orange or red. There is also a haze mode for strong air cleaning.
Sharp Air Purifier

I Like Korean Oppa.
Here is Sharp air purifier, model KC-D60E-W. When the air is dusty it will turn from green to orange or red. There is also a haze mode for strong air cleaning.