The LitterGuard Pro was tested by an independent third-party laboratory.
The result: 0.002 mg/m³ of ozone — 49 times below the emission limit set by the California Air Resources Board (CARB), the strictest air purifier standard in the United States.
Before you put any device in your home near your cat, you should know exactly what it emits. Negative ion devices produce a small trace of ozone as a natural byproduct. Every single one on the market does, and it has been that way for as long as the technology has existed. The question is how much.
You have the right to know, so we paid an independent laboratory to put the LitterGuard Pro to the test.
The LitterGuard Pro was tested by an independent third-party laboratory. The ozone output came back at 0.002 mg/m³.
Here's what that number means in practice. The California Air Resources Board (CARB) is the strictest air purifier regulator in the United States. CARB requires every air cleaning device sold in California to stay below an ozone emission concentration of 0.050 parts per million, which is approximately 0.098 mg/m³. Thousands of air purifiers you'd find in any home pass under that bar. Every air purifier legally sold in California must meet this standard.
The LitterGuard Pro's output is 49 times below that limit.
0.002 mg/m³ is a measurement of maximum concentration in the air itself, meaning how much ozone each cubic meter of air around the device contains. It's not a production rate, so there's no "per second" or "per hour." It works like a thermometer: when a room is 72 degrees, it isn't 72 degrees per hour.
Nothing. That's the honest answer.
Ozone is already a normal part of the air you breathe. It's outdoors every day, and on a sunny afternoon the air outside your window contains more ozone than this device produces. The clean, sharp smell after a thunderstorm is ozone at concentrations far higher than anything the LitterGuard Pro emits. The output is so low that most consumer grade ozone meters can't even register it. Detecting it at all requires laboratory equipment.
You will never smell it, sense it, or notice it. Neither will your cat.
It comes down to power. The LitterGuard Pro runs on 1 watt, which is less than a phone charger draws sitting idle on your nightstand.
Producing ozone at high levels requires serious energy. Industrial ozone generators are machines built to flood empty rooms with concentrated ozone for commercial disinfection, and they pull anywhere from 50 to over 200 watts.
At 1 watt, the energy to produce harmful ozone levels simply does not exist in the LitterGuard Pro. It isn't a setting that could drift or a filter that could wear out. It's a hard physical ceiling on what the device can ever emit, on day one and on day one thousand.
You've heard right. Ozone-generating air purifiers produce ozone deliberately, at high concentrations, as their entire method of operation. The EPA warns against them and CARB keeps a public list of hazardous ones sold as air purifiers.
The LitterGuard Pro is not one of those devices. It doesn't generate ozone as its function, and it couldn't if it tried. It's a negative ion device running on 1 watt of power, a hard physical ceiling that makes high ozone output impossible regardless of settings, age, or wear.
And we don't ask you to take that on faith. CARB enforces the strictest ozone emission standard in the United States: to be sold legally in California, an air cleaning device must stay below 0.050 parts per million. An independent laboratory measured the LitterGuard Pro at 0.002 mg/m³. That isn't just passing the strictest standard in the country. It's 49 times below it. Veterinarians and customers who'd like the full lab certificate can email hello@whisko.co.
Ozone in large amounts is indeed something to take seriously. But so are plenty of things you live with every day. Fifteen minutes of summer sun delivers enough UV radiation to damage skin DNA, and it's also how your body makes vitamin D. Researchers estimate Americans consume between 74,000 and 121,000 microplastic particles per year through food, water, and air. BPA, a known hormone disruptor, is detectable in the urine of over 90% of Americans. None of this means you should hide indoors, stop drinking water, or stop eating. It is the dose which makes any toxin dangerous, and equally any medicine effective. At 0.002 mg/m³, the LitterGuard Pro produces a dose so small that it is practically unmeasurable.
The LitterGuard Pro was built to run 24/7 with you and your furry friends' safety as our priority. Independently lab certified with that exact use in mind, the results speak for themselves.
Plug it in next to the litter box and forget about litterbox odor for good.
