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Pollution Around the World
If pollution stayed in one place, scientists could easily determine where it formed. But, like so much of the atmosphere, pollution is in regular motion. Winds carry particles and gases aloft, blowing them around the globe until they disintegrate or fall back to Earth. This creates a challenge for public policy leaders trying to control the sources of pollution. A major focus of NCAR research is tracking the paths of pollutants. For example, scientists using a computer model in 1998 found that 50 to 60% of sulfate aerosol in the Pacific Northwest appears to come from industrialized Asia—which may complicate efforts to keep the Northwest’s air clean. A large project in the summer of 2004 tracked pollution plumes as they leave the U.S. Northeast and head across the Atlantic.
To learn more about the impacts of pollution, scientists compare the atmosphere in relatively unpolluted places, like remote islands in the Pacific Ocean or Antarctica, with the air over industrialized regions. This way, scientists hope to understand the differences between “clean” and “dirty” air. But pollution is so far flung it even reaches areas once thought pristine. For example, NCAR scientists and their colleagues have sampled aerosols in the air over the southern Indian Ocean, far downwind of India.
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