Low Level Ambient Ozone Effectively Neutralizes Coronavirus

It is no surprise that ozone will neutralize coronavirus. Ozone is well known to be a powerful disinfectant. It is especially effective with small pathogens such as viruses and bacteria. Some of the more recent studies have demonstrated that coronavirus can thrive in the air in the form of aerosols breathed from people. Recent research has demonstrated that low levels of ozone gas effectively neutralizes coronavirus.

Ozone is a simple high-energy molecule of three oxygen atoms and will irritate sensitive tissue such as our lungs when ozone concentrations exceed 0.1 parts per million. The good news is that coronavirus is much more sensitive to ozone than our lungs are. “Scientists at Fujita Health University told a news conference they had proven that ozone gas in concentrations of 0.05 to 0.1 parts per million (ppm), levels considered harmless to humans, could kill the virus.”


The important details are the ozone level and the contact time. Coronavirus exposed to ozone concentrations of 0.1 ppm for 10 hours reduced the potency of the virus 90%. Ozone is not a magic bullet, but it is a valuable tool in our arsenal for fighting the virus. It is a safe, comfortable, and effective tool that can provide secondary benefits. The ultraviolet rays of the sun and lightning naturally produce low levels of cleansing ozone. Well-controlled equipment is already available to bring some of the fresh outdoors into our living and working spaces to stand side by side with others in the battle against viruses.

Oxidation Technologies has worked for years to produce safe and effective ozone generating equipment. We specialize in equipment controls to precisely maintain specified ozone levels for commercial applications. We have the equipment and expertise to maintain safe levels of ambient ozone that will greatly reduce the ability of coronavirus to thrive. We would be happy to assist in your efforts to get employees back into the workplace.

Ozone Regulations – what you need to know

Ozone in air is regulated by OSHA and the EPA.  NIOSH also offers recommendations, however they do not regulate ozone in any way.  It is good to be aware of the basics from each.

Ozone Regulations

OSHA (Occupational Safety and Health Administration)

OSHA guidelines for O3 in the workplace are based on time-weighted averages. 0.1 ppm for 8 hours per day exposure.

  • OSHA requires that if you are generating ozone that you measure this ozone level for safety purposes

  • The OSHA website cites several guidelines for ozone in the workplace

    • 0.3 ppm for no more than 15 minute exposure

    • 0.2 ppm for no more than 2 hours exposure

    • 0.1 ppm for 8 hours per day exposure doing light work

    • 0.08 ppm for 8 hours per day exposure doing moderate work

    • 0.05 ppm for 8 hours per day exposure doing heavy work

  • For more information see the OSHA web page regarding ozone

    • http://www.osha.gov/dts/chemicalsampling/data/CH_259300.html

NIOSH (National Institute for Occupational Safety and Health)

NIOSH safety and health standards are not enforceable under US law. NIOSH does “develop recommendations for health and safety standards” that may influence future law and OSHA regulations.

  • Max recommended exposure limit is 0.1 PPM

  • Ozone levels of 5 PPM or higher are considered immediately dangerous to life or health

  • Respirator Recommendations

    • Up to 1 ppm

    • Any ozone rated cartridge respirator

    • Any supplied air respirator

      • Up to 2.5 ppm

    • Any supplied air respirator operated in a continuous flow mode

    • Any powered air purifying respirator

      • Up to 5 ppm

    • Add face mask to respirator

      • Entrance into unknown concentrations

    • Self contained breathing apparatus with full face mask

EPA (Environmental Protection Agency)

The EPA measures, tracks, reports, and regulates ground level ambient ozone levels in large cities throughout the United States.

  • Good Up High, Bad Nearby

  • Ground level ozone

    • Ozone near the ground is considered pollution by the EPA and is regulated

  • Ozone generators that are sold as air cleaners

    • EPA does not recommend, or regulate ozone generators, it does offer safety information

  • Ozone Air Quality Standards

    • Primary standards set limits to protect public health, including the health of “sensitive” populations such as asthmatics, children, and the elderly.

    • Secondary Standards set limits to protect public welfare, including protection against visibility impairment, damage to animals, crops, vegetation, and buildings.

  • EPA Standards
    • 8-hour limit = 0.08 ppm
    • 1-hour limit = 0.12 ppm

For more info on ozone safety click here


Oxidation Tech offers a full range of ozone monitors.


C16 Sensor in Hand

Handheld Ozone Monitors

Aeroqual SM70 ozone sensor

Fixed Ozone Detectors

OZ-2 Dissolved Ozone Test Kit

Measure ozone in water

A23-14 Ozone Calibration Kit

Ozone Monitor Accessories

Plug-in Smart sensor

Replacement Ozone Sensors




Ozone used for odor control at wastewater plant

Ozone use for odor control is common and widespread.  Ozone is commonly used for odor control in casino’s, bars, hotels, and disaster restoration.  You can bet that if you have mold, or fire damage in your house, one part of the restoration process will be ozone treatment to remove the residual odors from the air.

Ozone is also used in some industrial applications and workplaces.  Rendering plants, meat packing plants, and pet food manufactures will use ozone to eliminate odor and make a more friendly work environment.  We have even been involved in applications where ozone is used in spice warehouses to reduce nuisance odors to neighbors.

Another common application of ozone over the years is waste-water disinfection.  Ozone can be used to reduce pathogens in waste-water prior to discharge.

An application gaining popularity is the use of ozone to reduce odor from waste-water.  This makes great sense as come waste-water treatment plants have a great deal of foul odor.  As the population of the earth grows the land near the waste-water plant becomes valuable, therefore encouraging operators to reduce foul odors from plants.

A great article on this application can be found below:

Ozone treatment proposed for some of Phuket’s stinking wastewater

PHUKET: Phuket Vice Governor Sommai Prijasilpa is pushing to install ozone generators throughout Rassada as a long term solution to wastewater problems in the area.

The vice governor yesterday afternoon inspected the new ozone generator used to treat water at Soi Paniang to determine whether the same machine could be used in Rassada.

“This machine was developed at Kasetsart University in Bangkok,” said Kanok Nakaew, chief of Research and Development at the Center for Energy and Environmental Engineering Laboratory at the university.

“It uses the advanced oxidation process, during which ozone is added to the water to kill off harmful bacteria such as coliform.

“Coliform can create negative effects if ingested by humans, including diarrhea and cramps.”

Mr Kanok added that water treated using the ozone generator meets the standards of the Pollution Control Department.

“The small ozone generator in Soi Paniang was installed as a short-term solution, but after seeing how it works I would like to see it installed throughout Rassada as a long-term water-treatment system,” Vice Governor Sommai said.

Mr Kanok explained that the treatment capacity of the generator varies according to the size of the machine.

“We would need to calculate how many machines are needed and how much water each one would be treating to know what kind of budget would be needed,” Mr Kanok said.

Rassada already has a 14-million-baht budget set aside for a long-term water-treatment system, said V/Gov Sommai, but it has not yet been decided which system to use.

“At our next budget meeting, I will propose ozone generators as a long-term wastewater solution. We should have an answer to the problem soon after,” V/Gov Sommai said.

Measuring Ozone in an Occupied Room

Measuring Ozone in an Occupied Room
ozone concentrations can vary greatly at various locations, and the concentrations are often highest in unexpected places. Key points to consider are:
  • Ozone is much heavier than air and tends to sink to lower levels.
  • Ozone has a low vapor pressure and so it doesnot try to fill the room uniformly. It tends to stay where it is.
  • Ozone tends to cling to rough surfaces such as fabrics and breaks down (converts back to oxygen) when passing through restricted and obstructed passageways.
  • Ozone reverts back to oxygen with a “half life” (time to go to half of its original concentration) typically of 10-30 minutes.
  • Ozone can be confused by instrumentation with other oxidizing gases such as chlorine compounds, acid fumes, and oxides of nitrogen (NOx). Strong “reducing” gases, such as vapors of alcohol and  solvents, can reduce the apparent concentration of ozone.
  • Ozone has a sweet smell, but the odor threshold varies widely by the person and by ambiental conditions. Therefore “smell” is not a reliable test for the presence or concentration of ozone.
The important measurement is:
What is the ozone concentration at the breathing level where room occupants will be?
For ozone introduced via HVAC systems with good room air circulation, the alternate point of measurement is near the entrance to the return air duct.
Suggested ozone Monitors:

A-21ZX Ozone Sensor
A-21ZX Ozone Sensor

C-30ZX Ozone Monitor
C-30ZX Ozone Monitor

OS-6 Ozone Controller
OS-6 Ozone Controller