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omid Feb 25, 2019 02:57 PM
Dear all,
I am doing a research on ozone production over Germany. Because your dataset provides different VOCs but you cannot check the availability of each, I would like to ask you for a help. My question is that, which one of these VOCs is more available (temporally and spatially) in Germany?
Because I am not a chemist, I would like to ask you which VOC has higher effect on ozone production. I have read Isoprene is of high effect. But I could not find it in Germany's data. Am I right?
Best regards,
Replies (2)
EEA Mar 05, 2019 09:51 AM
Dear M. Omid,

Thank you for contacting the European Environment Agency.

The Photochemical Ozone Creation Potentials (POCP) of VOCs are used to classify compounds according to their ability to form ozone. POCP is defined as the increase amount of ozone due to an increase amount of VOC divided by the increase amount of ozone due to an increase amount of ethene. These values vary with the conditions (meteorology and chemical regimes). You can use the values from

M.E. Jenkin, R.G. Derwent, T.J. Wallington, Photochemical ozone creation potentials for volatile organic compounds: Rationalization and estimation, Atmospheric Environment, Volume 163, 2017, Pages 128-137

determined for North-west European conditions. Indeed, isoprene (CH2=CH-C(CH3)=CH2) has one of the highest POCPs.

You can check the isoprene concentrations reported by Germany at https://www.eea.europa.eu/[…]/air-quality-statistics-expert-viewer. You should select

• pollutant = “CH2=CH-C(CH3)=CH2”
• country = “Germany”
• data aggregation process = “P1Y” and “P1Y-WA-avg”, for the annual means
• and then the year(s) you are interested in.

Finally, national emissions are reported for the total VOCs, and not for individual ones. You can check total VOCs emissions reported by Germany under the National Emissions Ceilings Directive at https://www.eea.europa.eu/[…]/necd-directive-data-viewer-1.

These data refer to the total amount of VOCs emission for the country as a whole; there is no obligation to report different species of VOCs. In order to collect this type of information, we might suggest contacting the Emission Inventory Unit of Germany to understand if and for which activities they may have a detailed emission inventory of VOCs. Some information may also be included in the Informative Inventory Report produced by Germany and available at this link: https://iir-de.wikidot.com/.

We hope that this information will prove useful for you.

Best of luck with your research.

With kind regards,
EEA Enquiry Service
omid Mar 09, 2019 11:41 PM
Many thanks for your comprehensive reply.