Originally published on January 22, 2014
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A recent study has shown that China's own poor air quality and the smog blowing across the Pacific towards the United States from China is caused by manufacture of goods for export to America.
The study, published in the journal Proceedings of the National Academy of Science (PNAS) shows that in 2006, sulfate concentrations in the Western United States increased 2 percent, and ozone and carbon monoxide levels also increased slightly because of the transportation of pollutants from emissions that resulted from the manufacture of goods for export to the United States.
It also examined the impact on China's own air quality. In 2006, China's exporting of goods to the United States was responsible for 7.4 percent of sulfur dioxide, 5.7 percent for nitrogen oxides, 4.6 percent for carbon monoxide and 3.6 percent for black carbon. Black carbon, a climate forcing agent formed through the incomplete combustion of fossil fuels, biofuel and biomass, is a particular problem because rain does not easily wash it out of the atmosphere which allows it to travel long distance. Black carbon is linked to asthma, lung and heart disease.
However, the amount of air pollution in the Western United States resulting from emission from China is still very small compared with the amount produced by sources within the country.
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