Nox Plotter (Expert mode)

The NOx plotter by Forschungszentrum Jülich uses hourly values of nitrogen oxide concentrations (NO: nitrogen monoxide, and NO₂: nitrogen dioxide) from the German air quality monitoring network. You can choose any station from this network and the web tool will calculate if the legal air quality threshold of 40 µg/m³ (annual mean value) has been exceeded, and by how much the emissions of nitrogen oxides must be reduced to meet the target value. The expert mode displays the data curves which are used for this calculation. To get a simpler graphical display of the results, please change to the standard mode.

The legal limit value of 40 µg/m³ NO₂ as annual mean is only exceeded at stations with a road traffic pollution signature. At these sites, nitrogen oxide emissions are dominated by road traffic and in particular by diesel combustion in passenger and transport vehicles. Therefore it is only possible to reduce NO₂ concentrations at these locations by reducing vehicle traffic emissions. It is not straightforward to estimate the required emission reduction based on the measured NO₂ concentration exceedance, however. Vehicle exhaust contains both NO and NO₂. Typically, the NO₂ fraction in the exhaust is only ~15% while the remaining NOx is emitted as NO. NO, NO₂, and ozone react with each other in an atmospheric chemical reaction cycle. Within minutes, NO reacts with ozone from the background air to form NO₂. During daytime NO₂ can photolytically dissociate to yield the NO and ozone back (see for example Tropospheric ozone).

One consequence of this chemical reaction cycle is the non-linearity of the relation between the emitted NOx and the measured NO₂ concentration. The more NO is contained in the air, the lower is the fraction of this NO that is converted to NO₂. This results in the necessity to apply over-proportional reductions of the NOx emissions, i.e. the higher the NO₂ exceedance, the more extra NOx emissions have to be avoided. The exact value can be obtained through the Jülich NOx calculator. It works by plotting the hourly measurements of NO₂ versus the sum of the NO and NO₂ concentrations. These curves are shown in the expert mode of the NOx plotter. In case you cannot find your favorite measurement location in the station dropdown list it is very likely that NO₂ concentrations at this station are measured through laboratory analysis of filter samples. Since the NOx plotter works with hourly data of NO and NO₂, it cannot make use of such measurements.


Just enter the name of a city or a street address in the location field and select a measurement station near you. Click on “Create Plots” and you will obtain the graphical results.

More Information on the diesel controversy: “Retrofitting and exchange campaigns for passenger cars alone are hardly enough to meet the limits in cities”

Please enter any place name.

Please enter any place or street name.


Data protection and privacy policy

We are delighted that you make use of the Stickoxid-Rechner web interface hosted by the Jülich Supercomputing Centre (JSC) at Forschungszentrum Jülich, Germany. We are committed to handling your personal data with care and we promise to take all reasonable measures to prevent misuse of your personal data. According to the General Data Protection Regulation (GDPR) of the European Union we are obliged to inform you about our use of any personal information which you provide to us and about your rights to inspect this information or request corrections, replacement, or deletion of this information. This data protection statement aims at providing you with all the information that is necessary so that you understand what we do with your data and that you can act according to the provisions set out by the GDPR.

1. Responsibilities:

The responsible web service provider of is:
Dr. Martin Schultz
Jülich Supercomputing Centre
Forschungszentrum Jülich GmbH
52428 Jülich

The data protection officer at Forschungszentrum Jülich is:
Frank Rinkens
Forschungszentrum Jülich GmbH
52428 Jülich

2. Acquisition and use of personal data will acquire and store personalized data from its users in the following circumstances:

  1. The web server(s) will record and log IP addresses, access times, and some rudimentary information about the operations performed for any access to the web pages. This information may be evaluated to infer anonymous usage statistics and optimize the service performance (including the possibility to block access in case of misuse). No attempt will be made to correlate this type of usage data with other personal data except if you specifically ask us to do so in order to better resolve any problems with accessing our services or retrieving data from them.
  2. Cookies: some of our web services use cookies to save information about your personal browsing preferences such as a default world region, filter settings, etc. You can manage your cookies with your internet browser. We cannot guarantee that it will be possible to use without consenting to the storage of cookies. We will make no attempt to evaluate cookie data, but it may happen that our services modify the information contained in cookies without notice, for example if new features are added or if features are modified or removed.

3. Sharing of personal data

We have no intention of sharing your personal data with anyone. In the unlikely event that this may be required, your personal data will only be shared with others if you explicitly consent to this transfer.

We may evaluate your personal data to derive usage statistics etc., but such statistics will only be published in anonymous form.

4. Legal basis for data processing

The processing operations is based on Article 6(1) lit. f GDPR. This legal basis is used for processing operations when processing is necessary for the purposes of the legitimate interests pursued by our company. A legitimate interest could be assumed if the data subject is an employee, client or guest of the controller.

5. Deletion or blocking of data

We adhere to the principles of data avoidance and data economy. Therefore, we only store your personal data for as long as is necessary to achieve the purposes mentioned here or as provided for by the various storage periods provided for by law. After discontinuation of the respective purpose or expiration of these deadlines, the corresponding data will be routinely and in accordance with the statutory provisions blocked or deleted.

6. User rights

As outlined in the GDPR you have the right to request information about the personal data we have stored about you and the use we make of this data at any time. You also have the right to request corrections, enhancements, or deletion of your personal data. We will respect any such request unless it would be in conflict with other regulations (which is rather unlikely as far as we can tell). Of course you can also revoke any consent for using your data in any of the ways outlined above or for sharing your data at any time, and we will act upon such requests without undue delay.

If you are under the impression that we don't handle your personal data with due diligence or if you wish to complain about any matters concerning your data privacy in connection to our services, you may contact the service provider, the data protection officer, or the Landesbeauftragte für Datenschutz und Informationsfreiheit (email: poststelle{at}{dot}de).

7. Validity of this data protection document

The terms and conditions set out in this data protection statement remain in effect until this declaration is modified. Any modifications which may affect your rights, i.e. any modifications beyond simple error corrections or clarifications, will be communicated on the web service as special alert.

If you have questions, encounter problems or wish to support us please contact