High in the atmosphere ozone is beneficial, but nearer the ground it is a pollutant that can cause significant damage to fields of wheat and maize
Emissions from vehicles in places like Beijing, China, are contributing to a rise in ozone pollution in East AsiaIncreasing concentrations of ground-level ozone in East Asia are causing ever more damage to crops. The relative fall in yields of wheat, rice and maize in China, Japan and South Korea is costing $63 billion a year, according toat the Nanjing University of Information Science and Technology in China and his colleagues.
Surface ozone concentrations in China have been rising by around 5 per cent a year, says Feng. “Such a fast increase of surface ozone has increased the ozone threat to crop yields,” he says.as it blocks dangerous ultraviolet light, but ground-level ozone harms plants and animals. Surface ozone forms when nitrogen oxides react with volatile organic compounds in the presence of sunlight.
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