China has pledged to cut its CO2 emissions at the start of 2030. This move would highly benefit its downwind neighbors, with less toxic air pollution.
A study on China’s air pollution, by researchers from the Massachusetts Institute of Technology, claims that by 2030, there will be around 2,000 fewer premature deaths in the U.S. from inhaling pollutants emitted from China. The U.S. isn’t the only one who will benefit, besides of course China itself; Japan and South Korea are anticipated to benefit as well. “It reminds us that air pollution doesn’t stop at national boundaries,” said a co-leader of the study, Valerie Karplus.
The study, which used computer models that track pollutants and information from global health statistics, is published in Environmental Research Letters.
China will benefit more than anyone if it follows through and curbs its emissions, which it will do mainly by cutting its heavy reliance on fossil fuels and coal. Chinese studies claim that, by reducing carbon, it could cut between 55,000 and 94,000 premature deaths by 2030.
Up to 60% of these premature deaths are caused by inhaling what scientists call PM2.5, which are tiny particles that invade the human body. The other 40% are caused by inhaling ozone, which is a toxic gas that’s formed when pollutants get heated in the lower atmosphere by the sunlight.
The researchers partly focused on pollutants coming from China that drift over the Pacific, then make their way to the United States. They found that fine particles, which would cause most of the premature deaths in Japan and South Korea, would become diluted by the time they reached the United States. However, the ozone would be more potent and cause most of the 1,900 premature U.S. deaths.
The study explains how the chemical ingredients of pollution react with each other and sunlight, producing the deadly drift of ozone and PM2.5. Some of the pollutants include black carbon, sulfur dioxide, nitrogen oxides, volatile organic compounds, and carbon monoxide.
Records from WHO’s mortality database were used to predict the rise and fall of resulting diseases. It showed that inhaling PM2.5 can cause lung cancer, heart disease, and cerebrovascular disease.
According to a 2010 estimate, exposure to air pollution, including ozone and PM2.5, caused 3.3 million premature deaths around the world.
