> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sonohealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Do Air Purifiers Help With Colds, Flu, and Airborne Viruses?

> What an air purifier can and can't do against airborne viruses, where HEPA filtration fits in a layered approach, and realistic expectations for cold and flu season.

Can running an air purifier help your household get sick less often? The honest answer is "it can help a little, as one layer" — not "it's a force field." Here's what the science supports and how to set expectations.

<Note>
  An air purifier reduces airborne particles; it doesn't disinfect surfaces or replace vaccines, hand-washing, and staying home when sick. Treat it as one part of a layered approach.
</Note>

## How viruses travel in the air

Many respiratory viruses, including those behind colds and flu, can spread through small airborne particles and aerosols that linger and drift in indoor air. Reducing the concentration of those particles is where an air purifier can contribute.

## What a HEPA purifier can do

A true-HEPA purifier captures a large share of airborne particles, including many in the size range that can carry viruses. The [AirPro's HEPA 14 filtration](/air-purifier/hepa-14-filtration) captures 99.9% of particles as small as 0.1 microns, and its design cycles room air repeatedly. By lowering airborne particle levels, it **may help reduce** airborne transmission risk as part of a broader strategy.

## What it can't do

An air purifier doesn't:

* Disinfect surfaces (viruses also spread by touch)
* Eliminate all risk in a room with an actively sick person
* Replace ventilation, vaccination, hand hygiene, or staying home when ill

It's a **complement** to those measures, not a substitute.

## Getting the most benefit

* **Match the unit to the room size** so it cycles the air enough times per hour — see [room coverage](/air-purifier/room-coverage).
* **Run it continuously** on at least a low setting; the [25 dB Night Mode](/air-purifier/for-bedrooms) makes 24/7 use practical.
* **Close windows and doors** during use so it isn't constantly re-cleaning incoming air.
* **Avoid ozone generators** marketed as "purifiers" — ozone can irritate airways.

## The bottom line

For cold and flu season, a HEPA 14 purifier like the [AirPro](/air-purifier/overview) is a reasonable layer in a household plan — most valuable alongside the basics, not instead of them.

***

**Related:** [HEPA 14 Filtration](/air-purifier/hepa-14-filtration) · [UV-C Sterilization](/air-purifier/uv-c-sterilization) · [Room Coverage](/air-purifier/room-coverage) · [For Bedrooms](/air-purifier/for-bedrooms)