Research and analysis

Development of a reactivity index for the control of the emissions of organic compounds

The development of a risk-based approach to the regulation of volatile organic compounds (VOC) according to the propensity to produce ozone.


Development of a Reactivity Index for the Control of the Emissions of Organic Compounds

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email Please tell us what format you need. It will help us if you say what assistive technology you use.


This study investigates whether current understanding of photochemical ozone formation is advanced and detailed enough to design control strategies for organic compound emissions, which differentiate between the different species. A relationship is constructed between the emissions of close on 100 individual volatile organic compounds (VOCs) and downwind ozone produced by them. Such a relationship should exist from a theoretical standpoint. We investigate here whether it is robust enough to be of practical use in the design of pollution control strategies for organic compounds in the UK. For the relationship to be useful it must be consistent under a range of realistic atmospheric conditions and this study reports on ozone produced for a carefully chosen, but limited number of situations.

Published 1 January 2003