What is UV-C Light Filter? Is UV-C Light harmful to humans?

The UV-C light filter, with one of four types of ultraviolet light (UV-A, UV-B, UV-C and UV-V), is commonly used in the air purifiers, or acts as a standalone air sanitizer to specially kill the germs, mold spores, mildew, bacteria and even viruses. We will find this air purification technology in not only the high-end machines, but also the affordable ones as well.

In real-world use, the UV-C light filter can work alone to end the life of bacteria and viruses, but you still need other physical air filters to collect the airborne particles. In our air purifiers, the most popular air filter to combine with the UV-C light filter is the True HEPA filter.

In Breathe Quality, we know all your problems of indoor air quality and air purifiers. We know that you need the best air purifier to improve your quality of life. We are the experts in the field of air purifiers, but more than that, we are just like you, a human. We also have serious problems with airborne allergies and asthma, and we know your struggle to learn the air purifier, and put an end to your misery. Today, you will know everything about the UV-C light filter in our in-depth guide.

If you have concerned about other air filter types as well, we hope that the below guides can help you.

1, True HEPA filter.

2, Ionizer.

3, Activated Carbon filter.

4, PlasmaWave.

I hope you are ready to know more about the Activated Carbon filter. Let’s keep reading.

What is UV-C light filter?

UV-C light, like radio waves and X-rays, is an invisible form of electromagnetic radiation. It makes up all wavelengths of electromagnetic radiation, including light, radio waves and x-rays which are arranged according to frequency and wavelength. UV light is a special type of radiation that can’t be seen by the naked eye because it is part of the invisible section that makes up the electromagnetic spectrum. To be precise, its wavelength is from 400 nm (750 THz) to 100 nm (30 PHz), shorter than that of visible light.

In air purifiers, the UV-C light filter, with the wavelength of only 256 nm, is able to kill microorganisms, such as germs and viruses effectively. By destroying the cells, the UV-C light filter will sterilize the microorganisms. However, it just prevents the DNA reproduction of these microorganisms, but not removes them from the air.

So to say, if you only use the air sanitizer with an UV-C light filter alone, it will only kill the bacteria and viruses that cause many of your diseases, but it won’t remove other potential allergens like dust, dust mites, pollen or pet dander. To do such task, you will need the True HEPA filter. Below are the most popular air purifiers with the combination of both True HEPA filter and UV-C light filter.

Is UV-C light harmful to humans?

Though many air purifier brands have stated that the UV-C light is completely harmless to humans, you must know the nature of UV-C light. The intensity of the UV-C light falls off significantly over distance, so the farther you are away from the UV-C light source, the lesser you are exposed to. Moreover, the absorption length of UV-C radiation in human skin is really, really short so that it won’t be able to reach the living cells.

So normally, the UV-C light cause no harm to humans. And most importantly, the UV-C light bulb is hidden completely inside the air purifier, so there is no way you will be exposed to the ultraviolet light.

However, the UV-C light filter is able to emit an amount of ozone, and the ozone is still the culprit of irritating asthma and many other breathing issues. If you don’t know, or if you experience the side effect from using an UV-C light filter, you should turn this function off as soon as possible.

To help you learn which air purifier is certified by the California Air Resources Board (CARB) to be safe to use, even with or without the UV-C light filter, you should check this California Certified Air Cleaning Devices. Or else, you only need to read our air purifier reviews to see if you can trust in one air purifier or not.

List of the best air purifiers

Pros & Cons of UV-C light filter

We have learned everything about the UV-C light filter, but you still don’t know if this air filter is flawless or not. Below is the pros/cons of the UV-C light filter.


  • Can kill the microorganisms such as germs, bacteria and viruses
  • The UV-C light cause no harm to humans

  • Still produces ozone
  • Needs to be changed frequently
  • High Power consumption
  • Can’t remove the actual particles from the air
Rating Breathe Quality
  • Average ratings for the post