Hemispheric Transport of Air Pollution 2010

Part C - Persistent Organic Pollutants

image of Hemispheric Transport of Air Pollution 2010
This is one part of a four-volume set that presents a state-of-the-science assessment of the intercontinental transport of air pollutants across the Northern Hemisphere. The first three volumes are technical assessments of the state-of-science with respect to intercontinental transport of ozone and particulate matter, mercury, and persistent organic pollutants. The fourth volume is a synthesis of the main findings and recommendations of Parts A, B, and C organized around a series of policy-relevant questions that were identified at the Task Force on Hemispheric Transport of Air Pollution’s first meeting.



Observations and capabilities

This chapter summarizes recent observations and measurements of POPs in various environmental media from which a better understanding of POPs transport on a regional, intercontinental or global scale can be derived. As explained in Chapter 1, POPs and POP-like chemicals are a unique group of pollutants that may be transported via the atmosphere or the ocean and has the ability to partition to and from various environmental media, degrade and transform along the transport pathway. Due to this complexity, an understanding of both primary and secondary emissions, as well as POPs degradation and transformation processes, is essential to interpret observed transport episodes, temporal and spatial trends. In this chapter, we have also summarized currently-available measurement techniques that may provide different types of long-range transport information and analytical techniques used to identify the historical signature and potential sources of POPs. While Chapter 3 provides detail information on the modelling aspects of POPs, specific transport and process models have also been derived and used to explain and elucidate various observed concentrations, trends and transport processes. Readers are referred to Appendix B for summaries of these studies where applicable.


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