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But experiments show that modified activated carbon can significantly improve the molecular adsorption for gas properties, so as to improve the ambient air quality of odors and harmful gases in the air such as secondhand smoke, formaldehyde, benzene, etc.

Air purifiers can be effective in improving indoor air quality. There are different types available, and those that use UV light capture and destroy viruses and bacteria present in the air.

However, the Environmental Protection Agency states that some UV air purifiers emit ozone gas. This can cause breathing difficulties, especially in people who have asthma.
This article discusses what a UV air purifier is and whether it is effective in providing a cleaner home environment. It also explores some HEPA air purifiers that a person may consider purchasing.
What is a UV air purifier, and how does it work?
UV air purifiers are devices that use UV light technology to capture air and pass it through a filter. The air then goes through a small internal chamber where it becomes exposed to UV-C light. Some air purifiers then filter the air again before releasing it back into the room.
However, UV air purifiers do not effectively remove volatile organic compounds (VOCs) from the air.
How effective are UV air purifiers?
A 2021 systematic review suggests that UV air purifiers that also use a HEPA filter may be effective at removing bacteria from the air. However, the researchers also point out that there is not enough evidence investigating whether UV and HEPA air purifiers can protect against respiratory illnesses.
The Environmental Protection Agency (EPA) states that people should not buy air purifiers that emit ozone. These can include UV air purifiers, electrostatic precipitators, ionizers, and plasma air purifiers.