How Is a HEPA Air Purifier Different From Other Air Purifiers?

Some air purifiers are not as effective as others. Most anyone who rates air purifiers go by what is called the HEPA standard. This is because HEPA air purifiers are widely known to be the best at filtering air, and have been for a while now. HEPA filter air purifiers are so vaunted because they stop air particles that are 0.3 micrometers in diameter. There is a purpose behind the focus on that specific particle size. The human body's respiratory system have a hard time stopping that particular size, and they are the most dangerous to us, moreso than particles both larger and smaller.