A consultancy study on volatile organic compounds
report
The contribution of Volatile Organic Compound (VOC) emissions to
the formation of ozone is accepted to be realistic and VOC emission reduction is
part of air pollution regulations under discussion. In this report we discuss the
Photochemical Ozone Creation Potential (POCP) concept in relation to these
regulations. The report describes the fundamentals and validity of the POCP
concept and concludes that it is scientifically sound but that a real validation of
the models with respect to ambient ozone measurements is still to be performed.
Suggestions for improvement of this situation are being given in the report.
POCP values are given for more than fifty specific solvents, mainly oxygenated
solvents, following the Derwent approach, in increasing order. It is discussed that
POCP values show an inherent range that finds its origin in the geographical
differences in concentrations of precursors and meteorological conditions.
Different models show variations in the exact values of the range but these
variations are minor to the range itself. However, a ranking of VOC’s based on
POCP values is possible. For some solvents the uncertainty in POCP value can be
reduced by performing model calculations or when better chemical data become
available
the formation of ozone is accepted to be realistic and VOC emission reduction is
part of air pollution regulations under discussion. In this report we discuss the
Photochemical Ozone Creation Potential (POCP) concept in relation to these
regulations. The report describes the fundamentals and validity of the POCP
concept and concludes that it is scientifically sound but that a real validation of
the models with respect to ambient ozone measurements is still to be performed.
Suggestions for improvement of this situation are being given in the report.
POCP values are given for more than fifty specific solvents, mainly oxygenated
solvents, following the Derwent approach, in increasing order. It is discussed that
POCP values show an inherent range that finds its origin in the geographical
differences in concentrations of precursors and meteorological conditions.
Different models show variations in the exact values of the range but these
variations are minor to the range itself. However, a ranking of VOC’s based on
POCP values is possible. For some solvents the uncertainty in POCP value can be
reduced by performing model calculations or when better chemical data become
available
Topics
TNO Identifier
252850
Publisher
TNO
Collation
45 p.
Place of publication
Apeldoorn