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How to communicate your odor mitigation plan


In the context of odor management, communication is of special importance and should not be set aside.

Exposure to offensive odors raise questions about potential health risks, loss of property value and the fear of additional odor episodes. They can become a source of stress, frustration and anger, especially when the neighbors do not feel that their situation is taken care seriously. The lack of communication can increase irritation and cause a loss of trust in those responsible (plant operators, policy makers and officials).

To communicate your efforts to reduce odors, your mitigation objectives, the budgets invested and results achieved can help to reduce the feeling of injustice and powerlessness that some residents may develop. Too often in tense situations, some facility operators fail to communicate their plan of action and positive outcomes obtained. Although significant improvements have been achieved in terms of reducing the level of odors and frequency of exposure, the discontent in the community has not necessarily diminished because a lack of communication and trust.

Proactive communication through an odor observer committee (OOC) is an excellent way to promote the emergence of communication between the managers of the odor emitting sites and nearby residents. In the process of setting up an OOC, a group of volunteers from the community are trained to recognize and quantify odors and how to report odors in a consistent manner.  The OOC provides an effective communication channel between members of the community and the plant managers. This helps to convey odor master plan objectives and odor observations relevant for environmental monitoring and management operations. On a regular basis, members of the OOC are invited to review the results of their participatory monitoring and actions implemented by the company.

As such, the company BFI Canada, part of Progressive Waste Solutions, operates a technical landfill in the Montreal’s suburban. This corporation is serious about environmental monitoring: they mandated Odotech to execute their air quality monitoring (VOCs) and to carry their odor observer committee since 2005. 

Community odor monitoring

As another example of best-in-class operation, BFI invited last May 4th, the local communities for its third open house, which were both an awareness activity and a large family party. On the menu: games, discoveries, tips and information on the various activities carried at the landfill in Terrebonne.

Participants of all ages were invited to take part in a guided tour of the site and learn more about the landfill, the waste management operations, the biogas power plant, the new biomethane production plant, the green waste composting facility and wastewater treatment plant. There was also information kiosk on environmental activities including the monitoring of odors and VOC.

community Odor monitoring training

Odotech team members are explaining to local resident odor impact assessments, odors, odor monitoring, odor observer committee and ambient air VOC monitoring program.   

The Odor Observer Committees and open house days are great ways to communicate the efforts made ​​to reduce odors. Holding public meetings to present the results of odor impact study and continuous odor monitoring are also effective: whether you are at the planning phase of the project, at the implementation phase or during normal operation of a plant.

Use the nose of your neighbors as mobile odor sensors!

At the age of Web 2.0, OdoView is a new tool of participatory management and communication with your local community. Using a smartphone application, members of your community can bring you essential information to help you better manage your operations and measure the impact of your actions by reporting odors in their normal business wherever they are . Odotech adapts the Smartphone application to your specific context including a website and a hotline for parallel ways to report odors. The results are available to you online through a web console. Discover this new tool already adopted by several operators and municipalities.

Odor Monitoring app
Download the OdoViewTechnical Documentation

First in Class Odor Monitoring in California @ CWEA Annual Conference


Orange County recently became the largest installation of OdoWatch - Electronic Nose and live plume Odor Monitoring - system in California.  They are currently monitoring their Plant 2 at Huntington Beach, and will be monitoring Plant 1 in the near future.

Odor prevention by electronic nose monitoring

We invite you to learn more on this project at the California Water Environmental Association annual conference & show show in Santa Clara this week May 1-3. Here is the link to the annual conference website for CWEA:



odor monitoring for WWTP

Kruger, the exclusive U.S. distributor for OdoWatch to municipal wastewater treatment facilities in the United States, is at the CWEA show in Santa Clara (Booth #407).  Reach out to Sharon Paterson, OdoWatch Product Manager at Kruger, to get more information on our latest OdoWatch installations in California. Stop by the Kruger booth to see what makes the Orange County system unique.  OdoWatch systems are used by any size WWTPs in order to understand their odor impact, be proactive, and find rational odor reduction solutions at the lowest operational and capital cost.  See how OdoWatch can save you money through using your capital and staff to their best possible advantage. 


Odor Control, Odor Prevention & Odor Modeling @ Waste Expo 2014


Year after year, WasteExpo is the waste management industry's largest conference and tradeshow of its kind in America, serving both the public and private sectors. Last year's Composting & Organics Recycling tracks were standing-room only and at its first edition! This year the Composting & Organics Recycling section of the Conference  willl have even more content and sessions.

Waste expo organic

Odotech is proud to present for the second edition in the Waste Expo’s Annual Organics Recycling and Composting Conference Program. You get last year presentation on Odor Monitoring for Anaerobic Digestion, Composting and Landfills by following this link.

April 29, Track 1 will focus on Compost Facility Development, Best Management Practices, Adding Food Residuals and Odor Control . We invite you to attend the 300PM session on Odor Control, Prevention and Modeling. Odotech will present a paper on Static vs. Dynamic Dispersion Modeling for Composting and Organics Recycling Facilities.  

Get the WASTE EXPO PPT On Static Vs. Dynamic Dispersion Modeling


Get the WASTE EXPO PPT On Static Vs. Dynamic Dispersion Modeling


This paper addresses the major differences between static and dynamic dispersion modeling for odor nuisance prediction and compliance:

  • Why does modeling fit into the planning for odor compliance and odor control?
  • What to model?
  • A quick summary of the data inputs needed to run a dispersion model in a Static or a Dynamic modeling perspective.
  • What are the benefits of each modelling approach?
  • Cases studies

Dispersion modeling defines the relationship between the emission source and the receptor. While control measures may be applied to the emission source, compliance with odor nuisance standards depend on whether the odor concentrations at the receptor have been adequately reduced with respect to their frequency, intensity, duration and location.

For existing sources, it is not possible to verify compliance with nuisance odor standards by monitoring odor concentrations at the receptor because of the low odor thresholds and the variable nature of odor impacts. For new or proposed odor emission sources, dispersion modeling is also the only method to determine compliance, since the potential odor emission source does not yet exist.

Static Modeling

Static modeling is where the odor source is sampled during few campaigns and the olfactometric results are used to assess a single steady state characterization of the source. Modeling is done using historical data from weather stations remote from the site. The results are probabilistic: odor impact assessment based on the pairing of "worst case" emissions with "worst case" dispersion. Compliance is based on some "acceptable" level of exceedence expressed as a percentile of number of hours. Static modeling is the only option for new or proposed odor emission sources, as the odor source does not exist and cannot be monitored. Static modeling is also called odor dispersion modeling assessment.


isocurve first max      

Example static modelling of the odor concentration (OU/m3) distribution centile 98

Dynamic Modeling

Dynamic modeling is a pairing in real time of monitored odor emissions and measured meteorology. The pairing of emissions and dispersion are not independent parameters as in the case above. The critical aspect of this is that odor control measures can be applied dynamically, based on predicted exposures and not limited to controlling the worst case condition. Dynamic modelling is the preferred option where the odor emission source is large and not easily contained using conventional odour control technology.

Dynamic Callpuff

Example dynamic modeling of the odor concentration (OU/m3) distribution over a 24 hours period.

How to Interpret Odor Nuisance Regulations


The most common approach to regulating odor impacts is through the interpretation of odor nuisance. The origins of odor nuisance regulations come from English Common Law which balances the rights of individuals. One has the right to swing their arm up to the point that a closed fist approaches another person’s nose. At that point, the other person’s right not to be assaulted prevails.

Odor nuisance does not prevent a person from creating or releasing odors, even offensive odors, from their property. However, that action is limited by the potential impact those odorous emissions have on their neighbors. The allowable threshold is not always clear. Like squirmy children in the back seat of a car, how close can you come to touching someone without being a threat?  “He’s touching me! No I’m not!” The allowable emission of odorous compounds without being a nuisance is also subject to interpretation.

Nuisance impacts are the most common reason that odors impacts are mitigated. While most states have prohibitions of nuisance impacts under common law, few states define what odor concentrations are associated with nuisance odor impacts and even fewer define what the frequency and duration of those impacts should be. In most cases, nuisance impacts must be verified by a regulatory authority to be considered valid.


Learn more about Odor By-Laws


Odor nuisance language can appear in an air quality statue as part of the definition of key words, such as “air pollution”, “air contaminant” or “nuisance”. It may also appear as a separate odor nuisance standard. An odor is a nuisance if it “unreasonably interfere with the proper enjoyment of the property of others” (Code of Maryland Regulations, Title 26 – Department of the Environment, Subtitle 11 – Air Quality .01 Definitions), “unreasonably interferes with the enjoyment of life or the use of property” (Connecticut DEM Regulations, Section 22a-174-23. Control of odors), and “unreasonably interfere with the enjoyment by the people of life or property” (Title 9 Virginia Air Code, 9VAC5-10-20. Terms defined).

To interpret odor nuisance standards, it is necessary to explicitly define what type of odor episode you are trying to mitigate and set frequency, intensity, duration values appropriate for that episode. There are common elements in the language of odor nuisance that allows us to interpret useful values. First, the affected person must not only detect an odor, the person must recognize the odor as being distinct from other background odors and be specific to a particular source. In a laboratory, a trained odor panelist can detect an odor is present in a sample when compared to carbon filtered air at 1 odor unit, even if the panelist cannot describe the odor. At about 2 to 3 odor units, a panelist can describe the character of an odor when mixed with carbon filtered air. For an untrained observer to detect an odor in the natural environment where there are competing odors, the odor concentrations need to be between 5 and 10 odor units.

The duration of the odor episode must be sufficiently long duration to interfere with the activities at the person’s property. The duration of the odor episode may be further extended by the requirement that a regulatory official confirm or verify that the odor is present. While a person can perceive an odor in a few seconds, it may take several minutes before the presence of the odor disrupts activities at a person’s property. It may take several minutes more before the affect person acts by filing an odor compliant. If a regulatory official is needed to confirm that an odor is present before a formal complaint can be filed, an odor may need to persist for a period of an hour or more.

To be a nuisance, an odor episode must be unreasonable. While a single odor episode may be unpleasant and disruptive, it may also have been accidental or unavoidable. Odor episodes that re-occur over a period of time become preventable and are an unreasonable imposition on the surrounding community. The relationship between frequency and duration and frequency and intensity are inversely related. Odor episodes with low odor concentrations and persist for short periods of time can be tolerated more frequently than high odor concentrations that persist for long periods of time.

odor nuisance plume

Example of a real time odor plume based on onsite continuous odor monitoring


Offensive odors provoke the strongest response. They may also be distinctive in their character relative to normal background odors, so that even a low odor concentration can result in a sharp response. However, even more pleasant odors if they have a high odor concentration and persist for an extended period of time with a high frequency of occurrence can be a nuisance.

When odor nuisances are interpreted in this manner, it is possible to apply standard measurement, monitoring and modeling methods to evaluate odor impacts and develop appropriate mitigation measures.



You want to know more onInternational Odor Regulations?Free review for downloadClick here


Odour Measurement Instruments and Odour Management Workshop - Compost Canada


After Nova Scotia, Edmonton, Vancouver and Toronto, the Compost Council of Canada concludes the Grand Canadian Tour of technical workshops - Compost Matters in Canada - in Winnipeg, Manitoba March 18th & 19th.

Compost Manitoba

Once more, Odotech is proud to partner to this great initiative an provide an technical session on odour management for organic waste facilities.

The workshop is hosted by Green Manitoba & Recycling Product News and numerous attentees are expected.

Green Manitoba Logo Recycling Product News 


Key matters for the industry will be covered:

  • Modernizing the Fertilizers Act and Regulations

  • Composting in Manitoba

  • Outreach to Residents and the IC&I Sector

  • Composting and Gardening Programs in the North

  • Compost Collection Program at the University of Winnipeg 

  • Updates from the Manitoba Composting Association Corporation

  • Compost Research on Potato Diseases and Production

  • Potency of Manure Compost: Knowing the Limit for Crop Production

  • IC&I Composting for Manitoba's Capital Region

  • Essentials of Odour Management at Organics Management Facilities, given by

    Jacinthe Bisson, Eng, Senior odour expert, Odotech inc.

Jacinthe is the leader of our Odor Science groupe. She ran numerous odour studies, odour observer committee and electronic nose projects.

Odotech is proud to be associated with the Compost Council of Canada to present the segment on the Essentials of Odour Management at Organics Management Facilities. We have prepared a special presentation for composting facilities, anaerobic digestion projects, landfills and others. Key topics will be address to provide attendees a complete tool box from the science of odour perception and odour metrology, odour management planning, odour impact assessment, continuous odour monitoring and odour control.

electronic nose composting plant 

Odotech has been in the business of odour management for 15 years and lead over 700 projects in all types of industries with teams of specialists in North America, Europe and Latin America. Odour studies, odour mitigation plans and prevention programs, Odour Monitoring System (e-nose) and real-time modeling tools (More than 100 systems installed, nearly half on organic waste sites). From 2009 to 2013 we worked with 70+ organic plants in Canada, USA, France, Chile, Norway, Brazil, Columbia, Belgium, Switzerland, Israel (Composting, Digestion, Landfills and integrated sites).


Harvest Power odor monitoring


Download the registration form


For additional information, please visit, email at or call 1-877-571-4769


Get the pre\u002Dtraining PPTEssentials of organics odour mangement

Measure Odor & H2S in Sewer Collection Systems in Real Time


The Water Environment Federation (WEF) Collection Systems Committee, in cooperation with the Chesapeake Water Environment Association and the National Association of Sewer Service Companies are holding the Collection Systems 2014 Conference this week in Baltimore, Maryland. This conference will draw professionals from around the region and across the country who share an interest in improving the combined and separate sanitary sewer collection systems. 


Odor and H2S emissions are major concerns for collection systems. What if operators could diagnose odor problems in minutes instead of hours or days?  How much could they save in chemicals, time, implementing new process and infrastructure corrosion?  Find out at the Collection Systems 2014 Conference this week!

OdoWatch is the only technology that measures odors the way humans experience them, in D/T or odor units.  Together with the real-time dispersion modeling created from actual on-site weather data and the emissions from odor sources, OdoWatch displays color-coded plumes of odor concentrations on and off site where they may be a nuisance.  No other technology provides such accurate, timely information on odors and H2S. Fnd information on OdoSulf, the newest H2S monitoring technology that can uses the OdoWatch platform to provide real-time plumes of hydrogen sulfide impact. Operators using OdoWatch for odor and H2S monitoring have saved hundreds of thousands of dollars in OPEX and CAPEX.

Contact Sharon Paterson, Kruger Product Manager for OdoWatch at to meet her at the conference.  See you at the event!


Get the WEFTEC abstractH2S Vs. Odor Units




Odour Monitoring Equipment Supplier‎


The OdoWatch Platform is a turnkey solution to provide all necessary equipment for real time odour monitoring. It includes the required odour and gas sensors and a weather station. It records and stores all monitoring data so you can review exactly what happened in the past.

Headwoirks odor monitoring

The e-noses are positioned near the odour sources of the site and measure the odour continuously. The odour data from the e-noses and the weather data from the weather tower are sent to the OdoWatch software, which models the atmospheric dispersion and displays the site’s odor plume calculated by AERMOD or CALPUFF. OdoWatch is calibrated to recognize and quantify (in odour units) the odours of each site.

Odotech's electronic nose has the capability to continuously monitor and record odour levels. It is composed of a matrix of 16 MOS sensors. OdoWatch also has the capability to continuously monitor and record H2S gas concentrations and integrate Multigas Detectors for real-time monitoring of up to four (4) different gases (H2S, NH3, SO2, VOC, etc.) concentrations.

Free White Paper How an eNose Does Work  

The OdoWatch Platform is installed all over the word from desert to northern areas (-20°C to +50°C). All units have weatherproof NEMA 4X enclosures.

In order to correctly monitor atmospheric dispersion, the OdoWatch platform is equipped with a Weather Station installed onsite for continuous weather condition monitoring and recording. Measured weather conditions are wind direction, wind speed, atmospheric pressure, rain, temperature, humidity and solar radiation. The Weather Station must be installed in an area free of weather turbulences caused by adjacent structures.

All devices installed on site transmit their data using eaither GPRS radios or radio wireless communications. Data is transmitted on a continuous and uninterrupted basis. Radio signals are 2.4 GHz frequency hopping spread spectrum (2.4 @ 2.4835GHz) in a master-slave configuration. No radio operating license is normally required .

OdoWatch can be accessed on the internet using a web browser. All odour, contaminant and weather data can be displayed in the OdoWatch interface. The OdoWatch Platform provides email notifications and Alerts points signaling when pre-set olfactory thresholds are exceeded.

odor monitoring Grit Removal 

Installation of the equipment of the OdoWatch platform is done by Odotech technicians. Training for operators and maintenance personnel is provided with corresponding documentation (O&M Manuals). Odotech provide all necessary training for maintenance people and operators.

All equipment installed onsite require either 120 Vac/ 60 Hz or 240 Vac/50Hz. Depending on the type of emission sources, it may be require to install heated lines and gas preparation units to prevent from humidity condensation.For the eNose, SulfNose and Multigas Detectors installation, it can be either on an existing structure or a custom pole. 


Odour Management session at Compost Matters in Atlantic Canada


Compost Matters in Atlantic Canada

FEBRUARY 11th & 12th 2014 - in AMHERST, Nova Scotia, the Compost Council of Canada initiates a grand Canadian tour of technical workshops.

Interesting topics will be covered:

Regulatory Updates: Modernizing the Fertilizers Act & Regulations

Technology and Processing Management:

  • Essentials of Odour Management at Organics Management Facilities

  • Ongoing Updates to the County of Colchester’s Composting System Incorporating Compostable Plastics in Municipal Organics Recycling Programs

Research: The Composting Process as a Means of Controlling Aleutian Disease in Mink

Compost Markets:

  • Lawn & Turf Soil Improvement Utilizing Dehydrated Compost Topdressings and Organic Fertilizers

  • CQA Analyses: How to Interpret and Make Best Use of the Analysis

  • The Compost Quality Alliance: Going Above and Beyond

  • Parameters of Quality 

Odotech is proud to be associated with the Compost Council of Canada to present the segment on the Essentials of Odour Management at Organics Management Facilities. We have prepared a special presentation for composting facilities, anaerobic digestion projects, landfills and others. Key topics will be address to provide attendees a complete tool box from the science of odour perception and odour metrology, odour management planning, odour impact assessment, continuous odour monitoring and odour control. 

how to gage compost odor


Download the registration form


For additional information, please visit, email at or call 1-877-571-4769


Get the pre\u002Dtraining PPTEssentials of organics odour mangement

Luigi Lo Basso, MBA joins Odotech as Vice President of Finance



photo llobasso

 February 5, 2014 - Montréal, Canada – Odotech Inc. (, a smart odor tracking and monitoring company, announced today that Mr. Luigi Lo Basso, MBA has been appointed to the role of Vice President of Finance of Odotech. As VP Finance, Mr. LoBasso will partner with the CEO and the executive team to shape Odotech's financial agenda for profitable growth.

He brings over 30 years’ experience with growing entrepreneurial and multinational public and private companies in Latin America, Asia, Europe, North America and the Middle East. His expertise includes developing business strategies; accounting, financial and administrative management; budget preparation and analysis; internal controls; policies and procedures; relationship management; and managing change.

I am proud to join Odotech - the world leader in real-time odor tracking management solutions.  OdoWatch - a dynamic odor monitoring and forecasting solution helps plant operators improve processes and reduce operating costs,” says Luigi LoBasso. “With offices in Montreal, France and Chile, this is an incredible opportunity for me to use my knowledge and experience to create a sound fiscal climate for the business internationally” he adds.


About Odotech Inc.

Odotech is an Cleantech company with a patented electronic nose system – OdoWatch - specializing in the measurement and monitoring of odors at waste water treatment plants, composting sites, landfills, rendering plants and industrial odor producing plants. The system alerts operators when odors begin to reach threshold values, enabling them to proactively respond before an odor problem occurs. As the population grows, moves close to odor emitting sites, the need for odor management is growing exponentially. Odotech services its international clients with sales and operations offices in Santiago Chile, Lyon France and Head Office and Manufacturing in Montreal Quebec.


- 30 –


CONTACT:       Marvin Garellek, International Sales Manager |

Odotech inc, 3333 Queen Mary Rd, Suite 301 Montreal, Quebec, H3V 1A2

(514) 340 5250 |


Perception & Measurement of Odors Compared To Noise


Odor perception involves several dimensions such as the detection threshold, the perceived intensity, the odor character (description of the odor or the odor image), the hedonic tone (appreciation) and the emotions they generate. With such complexity, one might think that odors are subjective and it is impossible to quantify them objectively.

To measure odors, best practices call for olfactometry and measuring odor concentration expressed in odor units per cubic meter of air (OU/m3). The perception/detection threshold of an odorous gas is defined as the gas concentration at which 50% of a human jury perceives or not, the odor in an olfactometry laboratory. This is unrelated to an odor quality determination. By definition, the perception threshold is equivalent to 1 OU/m3. The number of dilutions of the odorant mixture required to obtain 1 OU/m3 (detection threshold) indicates the concentration " OU/m3 ". For example, if 10 dilutions are required to reach the detection threshold, the odorant sample contained 10 OU/m3

odor concentration

Is it possible to draw an analogy between the perception of odors and noise?

Indeed. Both the public and professionals are familiar with the noise measurement expressed in decibels. Noise is also formed of frequencies (treble or bass). Series of sounds can create melodies that would trigger emotions.

Noise level: The number of decibels would be equivalent to the concentration of odors (odor level). In both cases there is an objective quantification method for the perception of our environment.

Noise composition: Sound frequencies would be equivalent to the chemical molecules that make up an odor. Like noise, an odor may be generated by a single odorous molecule (1 sound frequency) or a cocktail of molecules as is usually the case (multiple frequencies to noise). Like noise where some frequencies are undetectable, some olfactory molecules are imperceptible to humans, while dogs may react to certain sounds and odors hidden to us.

Melody: The different sounds amalgamated can compose a melody that may be familiar, as a fragrant chemical cocktail that could compose the odor of a flower bouquet 

Orchestre symphonique Montreal Parfum de fleurs printemps

The musical choices are personal to everyone. One can recognize a melody and appreciated it or not. Some will enjoy rock or techno music while others prefer classical music. Melodies, as well as odors, will appeal to our memories and provoke positive or negative emotions.

In noise measurement, it is irrelevant to assess the appreciation of the noise, as a melody can be enjoyable for some and unbearable for others. It is rather the assessment that a number of decibels is not exceeded. It is the same for measuring odor with  using odor concentration. People have their own olfactory preferences.

sonometre odeur decibel odeur 

To measure noise one will need to use a sonometer to quantify decebels and frequencies, while for odors, we use an olfactometer (odor concentration) and a gas analyzer, e.g. a chromatograph coupled to a spectrogram mass to know the chemical composition. An electronic nose can be used to quantify both the odor concentrations and identify odors images (melodies). 

Want to know more? Download our WhitePaper on Olfactometry versus Chemical Odor Characterization. Or our WhitePaper on the principles of how an electronic nose works.

White PaperMetrology of odors: Olfactometry vs. Chemical Analysis   White PaperHow Does Work an Electronic Nose
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