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Reme Halo Side Effects | Know the Risks

The Reme Halo is an in-duct air purifying device that has been garnering attention, in part due to recent events regarding Covid-19 and partly due to the fascinating technology that it uses. However, with new technology, there is always a question regarding safety. This is a particularly important question for the Reme Halo because these devices add things to the air we breathe.

While the Halo is considered safe by federal safety standards, we want to give you the rundown, so you can make a personal decision on what’s best for you!


The hydroperoxide ions produced by Reme Halo aren’t a health risk. Ozone, a by-product, can be harmful at certain levels. Ozone levels produced by properly functioning units aren’t enough to affect health. Risk increases if people are vulnerable, ventilation is poor, or other ozone-producing items are present.

What Do Reme Halos Produce/Release?

So, we’re all on the same page about the Reme Halo being an in-duct air purifier. That means it is installed inside your ducting system, and does as one might assume—it cleans the air with the purpose of making it safer.

In order for these devices to actually purify the air, however, they produce a hydrogen peroxide plasma, which is a “cloud” of ionized air. It is this plasma that is dispersed throughout your home via the ductwork, purifying the air by killing contaminants like viruses and mold spores and by making allergens big enough to be filtered out of the air. 

In addition to this hydro-peroxide plasma, the Reme Halo also produces small amounts of what is called ozone. Ozone is a molecule that is able to react with certain chemicals that cause odors, effectively neutralizing them.

Ozone Is of Most Concern

Of the materials that the Reme Halo produces, ozone is the concern. Let’s take a look at why exactly ozone can be harmful, and if that’s a problem with the Halo.

Effects of Ozone Exposure

Ozone is made from three oxygen atoms. That would make it seem harmless; it is just oxygen, after all! However, that third atom of oxygen in ozone reacts with other material around it.

This can happen with pollutants, creating what we know as smog, or it can happen to organic materials in our bodies. 

Exposure to ozone is not good for the body, to say the least. As ozone is something we breathe in, its harmful effects present most commonly and frequently as lung-related symptoms.

This means ozone exposure often results in shortness of breath, coughing, or throat and lung irritation. It can even cause headaches and nausea and leave people more susceptible to contracting illnesses. 

woman difficult breathing

For those with breathing difficulties or illnesses, their condition may worsen.

Long-term exposure and high-concentration exposure to ozone will have worse effects than minimal or short-term exposure.

Quantities Released Are Below Dangerous Levels

The Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH) set the safe ozone exposure limit at 0.1 ppm (parts per million) over an 8-hour period.

The FDA safety levels, however, are only .05 ppm for consistent exposure in an enclosed space (like your home!)

So, how much does the Reme Halo create?

It is difficult to find specific numbers. However, RGF, the Reme Halo’s creator, has been open about their products producing small amounts of ozone.

They have been equally open about the fact that their products’ emissions are tested, and that they keep below federal safety levels. This means that the Reme Halo produces less than 0.05 ppm.

What Increases the Ozone Risk?

While the Reme Halo does not create enough ozone to be a concern, there are a few factors that could increase the exposure risk. (However, the Halo’s output is so small that even these factors may not be enough to cause a problem.)

Defective Machines

As with all machines, defects are possible. A dryer may overheat, a toaster might short, and a hair straightener may fail to heat.

toasting bread overheat, short circuit

In the case of the Reme Halo, it is certainly possible that a faulty device may create an abnormal amount of ozone in comparison to what it is meant to.

Ozone is not easy to identify visibly, however, so it would be hard to tell if a device is over-producing unless you are sensitive to and recognize the smell of it.

If you’re worried about being able to identify high ozone levels, we have a section about measuring ozone below!

Other Ozone-Producing Appliances

Air purifiers like the Reme Halo aren’t the only devices in your home producing ozone. 

If you have many of the following appliances in your home, it’s possible that adding a Reme Halo to the mix could bring ozone levels past the “safe-zone.”

Laundry water treatment systems, fruit and vegetable washers, and facial steamers are all potential ozone-creators. Some refrigerators even have their own ozone-making air purifiers.

The list doesn’t end there. Some hair dryers and electric fans create trace amounts, too. Even office appliances like printers and copiers may be guilty!

This news might be reassuring to some who figure the trace amounts created by the Reme Halo are also harmless if they have already been exposed to similar levels without any signs of ill effects. Or the number of potential exposure sources might be worrying to those particularly worried about ozone.

In general, however, these machines and appliances should be safe if not used in close proximity to each other or all at once. You can always decide to research specific items and remove/replace devices that are less important to you, too.

Poorly Ventilated Spaces

Hazards like defective machines and high numbers of ozone-producing appliances are more likely to be a problem when living in a poorly ventilated home.

Poor ventilation could allow the minimal amount of ozone created to build up past safe exposure levels, as it won’t have an “escape.”

You may not know how well your home is ventilated, but there are a few things that can indicate that your ventilation isn’t sufficient.

Be wary if you’ve ever had sweaty windows or other moist surfaces crop up, if your home has ever had a mold problem, or if those living in the home get sick frequently.

If any of these signs seem familiar, you may want to look into your ventilation before deciding to add an air purifier to the mix!

Health Conditions

Many pre-existing health conditions may not mix well with air purifiers, though that may seem counterintuitive. After all, the Halo is meant to purify the air.

However, while the air purification may be a benefit to some, the additional ozone created may not be beneficial for others, especially if their health conditions are lung-related.

Individuals with asthma, bronchitis, recurring lung infections, lung cancer, or cystic fibrosis may potentially be more sensitive to the ozone that is created, as minute as it may be.

woman who has asthma holding_using an inhaler

If you or someone you are living with has a health condition like those listed above, you may want to carefully consider the pros and cons of a Reme Halo and even seek advice from your health practitioner. 

Part of this consideration may involve testing the ozone levels in your home beforehand, which we’ll talk about next.

Can You Measure Ozone Levels in the Home?

There are a few ways in which ozone can be measured at home. 

The first option works for intermittent monitoring or checking on occasion to ensure that the overall levels have not changed. 

This type of occasional check can be done with ozone test strips (amazon link). These work similarly to pH test strips, which you may have come across before.

A more consistent method of monitoring ozone levels is to buy an ozone monitor, which works in much the same way a carbon monoxide monitor might. Be sure to get one that reads below 0 ppm.

While ozone monitors may be more consistent, they are also quite pricey. Depending on what model you go for, one can cost anywhere from $100-400. But depending on your situation, that cost may be worth the peace of mind!

As an alternative, you can look at the Reme Halo LED. It is comparable to the Reme Halo, but it doesn’t produce ozone.

Sources

https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/cfrsearch.cfm?fr=801.415

https://airconditioningarizona.com/reme-halo-air-purifier-review/

https://airpurifiers.com/ozone-air-purifier-guide/

https://ww2.arb.ca.gov/resources/fact-sheets/ozone-emissions-consumer-products-study

https://www.cdc.gov/niosh/npg/npgd0476.html

https://www.epa.gov/ground-level-ozone-pollution/health-effects-ozone-pollution

https://www.epa.gov/indoor-air-quality-iaq/ozone-generators-are-sold-air-cleaners#what-ozone

https://homeclimates.com/blog/reme-halo-air-scrubber

https://www.honeywellhome.com/us/en/support/f300-electronic-air-cleaner-2/

https://www.hrv.co.nz/latest/10-signs-your-home-might-not-be-well-ventilated

https://molekule.science/ozone-removal-methods-filters-to-use-in-your-home/

https://www.osha.gov/chemicaldata/9

https://ozonesolutions.com/ozone-safety/

https://www.protechac.com/blog/reme-halo-vs-reme-halo-led/

https://rgf.com/products/air/reme-halo-whole-home-in-duct-air-purifier/

https://www.rgf.com/wp-content/uploads/2017/04/RGF_ASHRAE-Technical-Sales-Bulletin.pdf

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