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Science Wednesday: China and Global Air Pollution

2009 March 18

Each week we write about the science behind environmental protection. Previous Science Wednesdays.

About the author: Julie A. Layshock is a Ph.D. candidate in the Department of Environmental & Molecular Toxicology at Oregon State University. Her work is funded by an EPA Science to Achieve Results (EPA STAR) Graduate Research Fellowship. She is looking forward to a career focused on reducing human exposure to pollutants.

Westerly winds over the Pacific Ocean efficiently carry sea salt and dust from the Gobi Desert to the western United States. Recently, scientists have begun to detect other, less welcome, things in the wind, too: air particles laden with pollutants from fossil fuels.

People from countries around the world cause tons of pollutants to be emitted into the air we breathe. Everything from operating vehicles, to burning coal and natural gas for heat and electricity, and manufacturing and industry activities all contribute to the global transport of air pollution. The contribution this global transport makes to local air conditions is poorly understood, and the impact it makes to human health can not yet be estimated.

That’s where my research comes in.

image of author with clipboardI am working toward answering questions concerning long-distance air pollution and how China might contribute to pollution in the United States. In my travels to China, I have seen first-hand the effects air pollution can have on human health. Understandable questions arise: Can we really quantify the contribution of pollutants from China and determine the how they affect a person in the United States?

I spent several months in China collecting air particles that I can use to compare with ones I have collected in the Pacific Northwest. My goal is to identify specific pollutants arising from en route chemical reactions in the atmosphere. Using the chemical “signatures” of the particles, combined with powerful meteorological and wind mapping models, I aim to distinguish Chinese sources from our locally produced air pollution. In the laboratory, I am also designing toxicity tests using the collected particles and identifying the most toxic combustion byproducts.

The results of my research could provide much needed insight into the global movement of these combustion-derived pollutants that are attached to particles in the air.

Demonstrating that these pollutants are capable of traveling half-way around the world highlights the need to reduce this type of pollution. Alternative energies and creative pollution control techniques are just a few of the directions that could result from my research.

For further information, I can be reached at

Editor's Note: The opinions expressed here are those of the author. They do not reflect EPA policy, endorsement, or action, and EPA does not verify the accuracy or science of the contents of the blog.

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5 Responses leave one →
  1. Concept Cars permalink
    March 19, 2009

    Air pollution is the introduction of chemicals, biological materials and particulate matters that cause harm or discomfort to humans or other living organisms, or damages the environment into the atmosphere. Concept Cars

  2. Jennifer B. Freeman permalink
    March 19, 2009

    Much of the particulate pollution over Los Angeles originates in China, according to the Journal of Geophysical Research. Reported in 2007 in the New York Times
    –Jennifer B. Freeman
    Science and Sustainability Writer

  3. Mark permalink
    March 19, 2009

    That is a very interesting study. I would have thought that particulates from China would come down as rain before reaching the U.S., but it makes sense: clouds travel very far, and I suppose dust particles could be in those clouds?

  4. Ko Tanaka permalink
    March 25, 2009

    If this is in fact true that the pollutant from China is affecting the US soil, I wonder how the US made pollutant is affecting Europe, for instance.
    Reportedly, US is responsible for 25% of the global CO2 production, which is greater than that of China together with the fact that we are closer to Europe than to China, it seems only reasonable to believe that we, US is polluting Europe more so than China to us. Then again, this kind of objective study would never be funded… not by the US agencies, unfortunately.

  5. Ian permalink
    May 3, 2009

    Here in Northern Washington, a recent rain in the last week of April produced alot of dust on our cars, streets, and buildings. I know that Chinese dust storm season is March – May so it could be yellow dust but I can’t find any specific information. Usually the news around here makes a big deal about it. There was a large storm in China on April 23rd, but our dust washed out beofre that plus it takes a about a week to get here. Would you like a sample?

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