Purifier needed to clean our souls

Whether to buy an air purifier or not to buy one that is the question.

A friend told me that the latest air purifiers are able to not only effectively remove PM2.5 pollutants, they also effectively filter "micro-dust" pollutants with even smaller particle diameters. So he encouraged me to get one for my home to ensure the air within is clean.

A while ago, a friend of mine bought me a mask from Seven-Eleven, which has a detachable filter inside it to prevent the floating particles larger than PM 2.5 from entering one's lungs while one breathes.