A new study urges China to take steps to reduce nitrogen emissions, which contribute to acid rain that can damage soil and plants like these trees. Photo: Wikimedia CommonsScientists are reporting the first evidence that China's sharp focus on reducing widespread damage to soil by acid rain by restricting sulphur dioxide air pollution may have an unexpected consequence: Gains from that pollution control program will be largely offset by increases in nitrogen emissions, which the country's current policy largely overlooks. The study, which suggests that government officials adapt a more comprehensive pollution control strategy that includes a new emphasis on cutting nitrogen emissions, is scheduled for the Nov. 1 issue of ACS' Environmental Science & Technology, a semi-monthly journal.
Lei Duan and colleagues explain that China is trying to stop soil acidification by reducing sulphur dioxide pollution from electric power plant smokestacks. Those emissions cause acid rain, which in turn has made vast areas of farmland more acid and less productive. China's is striving for a 10 per cent reduction in sulphur dioxide emissions by 2010, a policy that seems have had only a limited impact so far, the researchers say. However, China has paid little attention to pollution from nitrogen oxides, which also contribute to acid rain and soil contamination.
The scientists' analysis found that the benefits of sulphur dioxide reductions will almost be offset by increased nitrogen emissions. To control this problem, "China needs a multipollutant control strategy that integrates measures to reduce sulphur, nitrogen, and particulate matter," the article notes.
