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Hemispheric Transport of Air Pollution 2010

Part A - Ozone and Particulate Matter

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.

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Observational evidence and capabilities related to intercontinental transport of ozone and particulate matter

For several decades it has been possible to measure particulate matter, ozone (O3) and their important precursors at even the lowest concentrations found in the most remote regions of the Northern Hemisphere. Even the earliest measurements found that long-range transport exerts a strong influence on these observed concentrations. For example, dust of Asian origin was observed throughout the North Pacific region [Duce et al., 1980; Prospero, 1979] and studies at the west coast of North America in 1985 identified the influence of Asian emissions on the sulphur budget [Andreae et al., 1988] and on the concentrations of O3, hydrocarbons, and peroxyacetyl nitrate (PAN) [Parrish et al., 1992]. It has also been clear since at least the 1980s that increasing anthropogenic emissions of NOx since preindustrial times have led to pronounced ozone concentration increases throughout the Northern Hemisphere [e.g., Crutzen, 1988].

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