NTA 9065, the Dutch standard on dynamic olfactometry accepted for public consultation

on . . Hits: 3161

NTA9065 drafts   The Dutch standard NTA 9065 on Odour Measurement and Calculation was first published in 2012. Now 8 years later, a revision of this standard is ready for public comments until the 1st of June 2020.  The text provides requirements and instructions for the standard procedure for conducting odour testing in the Netherlands and it has been divided in 2 parts: NTA 9065 Part 1 dealing with planning, execution and reporting of odour investigations and NTA 9065 Part 2 dealing with sampling and analysis.

   The NTA 9065:2012 has had a short life. However, due to new European developments in the field of odour testing, and the reformulation of the requirements with regard to odour sampling and odour analysis for the purpose of accreditation, the Dutch Standardization body decided to start a procedure to revise it. After an intensive work of all committee members, the draft is ready for comments. These are some of the important points in the NTA 9065.

  In order to better distinguish which part of the NTA falls under accreditation, it was decided to split the NTA into two parts:

  • Air quality - Odour measurements - Part 1: Planning, execution and reporting of odour investigations:
  • Air quality - Odour measurements - Part 2: Sampling and analysis:

Part 1 describes the design, execution and reporting of odour testing, describing a preferred method from which it is possible to deviate in specific situations.Part 2 describes the requirements for odour sampling and odour analyses, where the main text contains the methods that may fall under accreditation and the appendices contain alternative methods.

  After a quick overview to the draft of the part 2 of this standard, these are some relevant news for odour managers in the Netherlands:

  1. At least three samples must be taken per source and the flow rate must be measured also three times.
  2. Sampling time to withdraw a sample is at least 30 min.
  3. When changing the source to be sampled, the sampling train must be effectively cleaned or replaced by demonstrably clean parts.
  4. Field blanks should be taken to check if the sampling train is odour-free.
  5. Maximum allowed odour concentration of the field blank is 80 ouE/m3
  6.  Sampling hoods are no longer valid to sample active area sources. Either you cover everything up and sample, or you cover partially at least 50% of the total area.
  7.  Only the forced choice method is allowed for analysis
  8. A minimum of 6 panel members are required for olfactometric analysis.
  9. A factor 2 is taken as permissible measurement uncertainty.
  10. Labs are required participate in proficiency tests annually.
  11. Design criteria for Wind tunnel are specified in an informative annex. As this annex is informative, no specific design for wind tunnels is mandatory.

 An important aspect to consider is that following the points 1 to 4, total time to sample a source will be over 4 hours per source considering setting equipments, flushing bags, 30 min sampling time, taking triplicates, measuring three times flow, cleaning or replacing equipment and getting a field blank.

We have asked an odour expert to detail in a text some of the relevant changes in part 1.  Very important concepts such as the odour load are introduced in this standard, and they need a more detailed explanation. There are many more relevant aspects of part 1 for odour managers, but this post is already too long.

   The Netherlands have a very active group of odour experts that have been working for years in standardization. Quite often they set criteria that are later incorporated in other standards such as the EN 13725. That is why, this standard is relevant for odour managers.

  If you know a bit of Dutch or you use an online translation tool, it is possible to access the draft and comment it by registering here until 1 June 2020. 


   If you find this article interesting, you might be also interested in these articles:

Comments (0)

There are no comments posted here yet

Leave your comments

  1. Posting comment as a guest.
Attachments (0 / 3)
Share Your Location
  • Merry Christmas and happy festivities

    22 December 2021
     We hope you spend a wonderful time with your family and friends on these special dates. Many things have happened along this year 2021. It was a complicated year in general and particularly hard...
  • Drone-based environmental odour monitoring: SNIFFDRONE

    23 November 2021
       Wastewater treatment plants (WWTPs) produce gaseous emissions that might be olfactory annoying to the surrounding population. Current odour assessment methodologies are based on costly ...
  • Rubix changes to Ellona

    10 November 2021
        The French company Rubix, directed by the Mr. Jean-Christophe Mifsud, former CEO of Alpha MOS is switching to a more intelligence-focused service and that is why the company recentl...
  • Incidence with olores.org e-mails

    10 November 2021
       For technical reasons, we were unable to receive or send e-mails from our Olores.org accounts during a couple of weeks of November. So, if you contacted any of us from the 3rd November un...
  • New Development International handbook on Odour Management Plans

    29 July 2021
       The AMIGO Association is starting to take the first steps to create an International Guideline on Odour Management Plans (OMPS) and is looking for volunteers with experience in this fie...
  • Standard development on IOMS halted

    29 June 2021
       Over five years have passed by since the first meeting of the Working Group (WG) 41 dealing with Instrumental Odour Monitoring Systems (IOMS). WG41 is under the umbrella of the Technical ...
  • Registration for the EN 13725 Interlaboratory Comparison 2021 is now open

    09 March 2021
       Olfasense has announced the registration for the annual proficiency test for Dynamic Olfactometry according to the European Standard EN 13725. All laboratories around the world are invite...
  • IEEE looks for Standardization Volunteers

    26 January 2021
       The Institute of Electrical and Electronics Engineers (IEEE) has launched a new open call for experts to participate in several new standards related to Olfaction Devices. The organizatio...
  • What happened in 2020 in the odour management world

    31 December 2020
    The team of Olores.org would like to wish all its readers a Happy New Year. Again Olores.org has grown beyond our wildest expectations. In terms of readership, this year we got about 63,088 page views...
  • 1st Workshop of ASPIDI project in Puglia, Italy

    25 November 2020
       This Thursday, November 26th, at 15:00 (CET), the first workshop of the ASPIDI project (Automatic System Supported by the Population for the Identification of Diseases by Smelling Immunit...

Please note that this site uses cookies in order to work properly.

See more about our cookie policy Learn more

I understand

Please read the following to learn more about our cookies policy:


What are cookies?

   A cookie is a text file stored in a user’s web browser on any device they use to access a website that holds information regarding the user’s visit, such as preferences. When the user returns, the browser provides the cookie with the stored information to the site.

What cookies are used for?

   Cookies are used for adjusting a website’s content to fit a user’s preferences and optimize the website. They store useful information that improve the user’s experience of a website. They are most commonly used for:

  •     Recognizing the type of device a user is browsing with and any preferences applied to optimize the website specifically for the device.
  •     Creating statistics that help website owners to understand how their users interact with their website, which allows them to improve their structure and content.

What types of cookies are used?

   There are two types of cookies: persistent cookies and session cookies. Persistent cookies remain on your hard drive for a period of time specified in the cookie’s file parameters or until removed manually. When you return to a website and it requires you to login again despite previously storing your login information, it is usually because the persistent cookie expired; this helps to increase security while maintaining accessibility.

   Session cookies, on the other hand, are used temporarily and expire once the website or browser is closed. They are used to track user activity on a website during a single visit. When a website requires that you verify your age or location once every visit before allowing you to view content and without requiring additional personal details, that is a session cookie at work.

Do cookies include personal data?

   If there is a need for the collection of personal information, such as for creating accounts, then cookies may store personal information. However, it is required by data protection law that users are informed of the collection of personal data. This data will also be encrypted to render it inaccessible for unauthorized users.

Managing cookies

   By default, browsers are configured to accept cookies. However, these settings may be changed to block cookies entirely, or to inform the user each time they are used. Detailed information about cookies and the options associated with them are available in each browsers’ settings.

Which cookies does collect olores.org?

   Olores.org collect cookies for 2 purposes:

  • Register statistical data.
  • Set language preferences.

   In addition we use third party cookies through Statcounter to collect different data.

StatCounter Analytics Cookies

   StatCounter is a web analytics service. We use StatCounter to track activity on our website. These stats help us to understand how people are interacting with our website and to improve the design and functionality of our site so that we can offer a better online experience to our visitors. If you visit olores.org, a StatCounter analytics cookie (called "is_unique") may  be placed in your browser.  This cookie is used only to determine whether you are a first-time or returning visitor and to estimate unique visits to the site. No personal information is stored in the cookie.

Refuse Statcounter cookies.

You may set your browser to refuse/accept StatCounter analytics cookies by clicking here.


    • Your decision to refuse/accept StatCounter analytics cookies applies to all websites which use the StatCounter service (including the StatCounter site itself).
    • If you refuse all StatCounter analytics cookie, a refusal cookie (called "refusal_cookie") will be set to remember this preference and any existing StatCounter analytics cookies in your browser will be destroyed.
    • If you delete/remove/destroy the refusal cookie, you must revisit this page in order to re-set your preference.
    • The refusal cookie is set only for your current browser and machine. If you use multiple browsers/machines, you must set a refusal cookie in each case.
    • You can also change your cookie settings directly in your browser. Learn more about cookies and how to manage them here: http://www.allaboutcookies.org/cookies/index.html
    • Or you can learn about how to adjust cookie settings for specific browsers here: