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 use for Wastewater Disinfection

Wastewater Disinfection

Ozone used for wastewater disinfection has the potential to lower/eliminate chemical additions into water providing for a green solution and save you money.  Ozone is a powerful oxidant that will provide excellent disinfection to any water stream.  The oxidation potential of ozone is greater than that of all other chemicals used for wastewater disinfection.

Ozone ws initially utilized for disinfection of drinking water starting back in 1906.(history of ozone use)  The use of ozone for wastewater disinfection did not gain attention until the early 1970’s.  By 1984 there were 43 operational municipal wastewater treatment plants utilizing ozone for disinfection in the United States alone.  However, the implementation of ozone in large scale municipal plants stagnated after about 1985.  This was due mostly to the low cost of chlorine, and the lack of regulation on chlorine residuals in water.

Ozone use for wastewater disinfection has again gained attention in recent years.  Ozone is again becoming cost effective and necessary for three main reasons.

  • Chemical costs have increased dramatically in recent years.  Handling costs, storage costs, and cost of the raw chemical have created a for a high cost for traditional chlorine and even chlorine dioxide.  This has allowed ozone to become a more cost effective solution.
  • Regulations are getting tougher to meet with traditional chemicals.  Regulations on e.coli, and coliform bacteria are becoming lower and lower in most every state in the nation, and even worldwide.  Combine this with lower discharge limits on residual chlorine.  This requires higher chemical usage for chlorine removal from water after disinfection.  These lower discharge limits for bacteria, and chlorine create an atmosphere where ozone is very cost competitive, and may be the only viable option for some treatment facilities.
  • Micro-pollutants, or Endocrine Disrupting Chemicals (EDC’s) are becoming a major concern in rivers and lakes where wastewater is discharged.  Ozone orAdvanced Oxidiation Processes (AOP) are proving to be the only viable option for removal of these contaminates in wastewater.

Add to these primary factors that ozone is a green technology that may reduce overall energy consumption and chemical residual in water and ozone looks very attractive for many plants.  Both municipal wastewater treatment plants, and industrial plants, such as meat packing plants have been investing in ozone systems for wastewater disinfection in recent years.

Learn more about ozone and wastewater treatment HERE.

Ozone for removal of Endocrine Disrupting Chemicals (EDC’s)

Ozone use for removal of Endocrine Disrupting Chemicals continues to gain attention.  There are very few oxidants with the potential to remove or successfully bread down EDC’s in wastewater.  The use of ozone in water treatment and AOP is continually researched and tested with the anticipation it may be the technology of choice in the future.

A recent article again lays out some new techniques and results of ozone use for EDC removal.  Read full article HERE, or see excerpt below.

Newly developed oxidation process uses ozone to degrade contaminants in water

At the Center for Research and Assistance in Technology and Design of the State of Jalisco (CIATEJ) at the east of Mexico, an oxidation process was developed that uses ozone to degrade contaminants in water that alter the synthesis, transport, action or elimination of natural hormones, responsible for maintain self-regulation of metabolic and reproductive processes in living beings.

These compounds represent a potential risk to human health associated with problems in the male and female reproductive systems, and some of them are precursors of breast and prostate cancer.

The research team led by PhD Alberto Lopez at CIATEJ carries out the procedure by gas-liquid reactors, where the water with the presence of such substances called disrupting compounds of the Endocrine System (EDCs) is passed through a gas stream with ozone, which is a major oxidant.

And under certain conditions of temperature, pH, pressure and ozone dosage the EDCs are degraded to less than 95 percent of its initial concentration, exceeding conventional water treatment processes that just reach a 50 percent removal.

EDCs are found in surface water, soil and air. There is great diversity of them, basically solvents, organochlorine pesticides, flame retardants, plasticizers and synthetic and natural hormones.

Read full article HERE

Learn more about EDC’s and the potential danger the pose today and in the future from the World Health Organization.

Oxidation Technologies provides System Integration for both ozone systems and AOP systems for wastewater treatment applications.  If you are looking at researching this application or any other with a pilot test or full scale equipment, give us a call. We would be glad to help.

Aeroqual Cloud Based Air Monitoring


We recently released a cloud based instrument operating system, Aeroqual Cloud, now for use on the AQM 65. In conjunction with Aeroqual Connect, Aeroqual Cloud helps you stay connected to the instrument and access your data wherever you may be giving you a high quality air monitoring experience.

For a general introduction to Connect and Cloud, check out this video:

Both Connect and Cloud are accessed through your web browser (no software install required) and appear quite similar, so people often ask us why they need Cloud when they already have Connect…

Here is what we tell them!


You access Aeroqual Cloud the same way you do Gmail, for example. The data is stored on third party servers and you access it over the internet using your office or home broadband connection. Most people these days enjoy speeds of 2MB/s or better. So if you want to get access to the instrument or your data browsing from page to page in Aeroqual Connect will be just as fast as browsing any webpage.

Aeroqual Connect on the other hand is a direct connection from your computer, tablet or phone to the computer on the instrument. If that connection is made over a cellular modem, every new page will require data to pass over the cellular network. This greatly reduces browsing speeds compared to a normal broadband connection.


The cellular network can be unreliable. Power cuts can also occur. There might be an instrument fault. In these events you will be unable to access your data via Aeroqual Connect.

Because Cloud backs up data to third party servers, you can always go to Cloud to access your data. It will be current right up until the moment the outage occurred.

This also means your data is completely secure. Even if you lose the data from your PC or the on-board instrument storage fails – Aeroqual Cloud will have a complete record of every measurement you ever made.


For those accessing the instrument remotely over the cellular network data usage costs will be a factor. Every page load in Aeroqual Connect uses data over the cellular network. Downloading data will too.

Aeroqual Cloud syncs data between the cloud servers and the instrument. Sync-ing uses cellular data, but accessing the data on the cloud servers does not. So interacting with Aeroqual Cloud will use less data than interacting with Aeroqual Connect.

Data usage costs could get high if the instrument was being accessed by several different users. Each person would be interacting with the instrument, viewing and downloading data. In cases like this Aeroqual Cloud would be a much better option.


Only Cloud gives you the ability to set SMS and email alarms.

Let’s say you are in charge of a large mine site and the neighbours get upset when the wind blows dust in their direction. Cloud lets you set up an alarm that will trigger when dust reaches X on the monitor closest to the neighbours. You will get a notification either by SMS or email that the limit has been reached. You can then initiate a response to bring the dust levels under control. The same could apply for a power station – where SO2 leaks might be a concern. Or a roadside station where NO2 might reach dangerous levels.

In addition the alarm can be based on more than one parameter. So it could be based on X ppm SO2 and wind direction being SSW. Cloud let’s you choose multiple parameters. It also let’s you set unlimited number of alarms and send them to an unlimited number of email and SMS recipients.


Cloud gives you much more control over user administration. Advanced user access management means different access levels can be granted to different parties. For example, you may give the local distributor who sold you the equipment advanced access rights; you might give your local government agency view-only rights.

Cloud also gives Aeroqual much better access to your instrument. This means if there are any problems we can quickly and easily look up the data, check the instrument log, and view the settings. If it turns out there’s a problem we can remotely adjust settings to correct the problem. Or we can instruct you or the distributor how to fix the problem. Having the manufacturer connected to your instrument gives you a huge amount of confidence.

Aeroqual Cloud air monitoring experience