US$ 225 to breathe safely indoors.

Most days, it's not possible to breathe safely outdoors for three or four months every year (December, January, February, March), but it's often not safe to breathe indoors either. Hence, the need for air purifiers. 

Sure, fixing the root cause of the problem would be the way to go, but that's not how it works here. I believe the idea is that if you deny the existence of a problem strongly enough, it will cease to actually exist.

At any rate, we just paid US$ 225 in order to breathe safely indoors. This is our first air purifier, but not our last. In addition to this one in the living room, we'll need at least two more for bedrooms.

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