The study, which provides the first satellite-measurement-based estimate of the amount of airborne particles that come to North America from overseas, shows this migrating dust usually comes in at high altitudes and in the U. Most of the pollution migrating into the North American atmosphere is not industrial emissions but dust from Asia, Africa, and the Middle East, , Yu found.
Cause and Effect Essay Example: Air Pollution Poignant Matters
Out of the total annual accumulation of foreign aerosols, The EPA is aware that foreign pollution affects U. The study revealed that much of the dust migration occurs at high altitudes and is unlikely to affect the air we breathe.
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However, Yu adds: "Scientists need to acquire a better understanding of the interactions between dust and climate. Current satellite sensor technology allows scientists to track aerosol plumes across the ocean and measure their composition and particle characteristics. The three-dimensional satellite measurements can distinguish dust from other types of aerosols such as those released from burning biomass and fuel.
While dust and combustion aerosol migration occurs year round, it is heightened in the spring due to strong seasonal wind patterns and extra-tropical cyclones. With ever expanding drought conditions due to climate change, we can expect trans-boundary transport of dust aerosols to increase in the future". Materials provided by University of Maryland.
Water and Air Pollution
Original written by Evelyn Rabil. Note: Content may be edited for style and length. Science News. Story Source: Materials provided by University of Maryland.
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Placing limits on coal use is also consistent with pledges made by President Xi Jinping to try to reduce the effects of climate change. The new study projected four scenarios based on different possible government policies, and each projection showed a decline in the average levels of PM 2. Even under the most stringent policies on coal use and energy efficiency, coal is expected to remain the single biggest contributor to PM 2. The study was a follow-up to a Global Burden of Disease study examining deaths in , which estimated that PM 2.
Premature deaths due to PM 2. A larger study on deaths was published last year by The Lancet, a British medical journal.
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That study estimated the number of premature deaths in China in related to PM 2. Researchers found that outdoor air pollution was the fifth leading cause of premature deaths in China, behind high blood pressure, smoking, high consumption of sodium and low consumption of fruit.
Household air pollution was the sixth leading cause. An earlier Global Burden of Disease study that examined health figures for found that outdoor air pollution contributed to 1. Exposure to ambient particulate matter that year was the fourth leading cause of premature deaths in China.
Follow Edward Wong on Twitter comradewong.