Text - Air Pollution
Scientists have revealed that air pollution is responsible for a significant reduction ∈ intelligence. Research conducted for the World Health Organization (WHO)∈China showed that air pollution was responsible for notable falls ∈ student test scores for languages and arithmetic. The Chinese study is called, "The impact of exposure to air pollution on cognitive performance". It was published ∈a journal called, "Proceedings of the National Academy of Sciences". The study took place over a period of four years. Researchers analyzed verbal and arithmetic tests taken by 20.000 people of all ages. They said: "Polluted air blocks cognitive ability as people become older." Researchers say their study is a warning to the rest of the world, especially to those who live ∈ cities. The WHO says over 91 per cent of the world population live ∈ areas with toxic air. Air pollution is currently the fourth highest cause of deaths worldwide. The researchers discovered that the longer people were exposed to polluted air, the greater was the damage to their intelligence. They likened the impact of air pollution to losing a year's worth of education. For those aged over 60, this could be the equivalent of several years of lost education. Researcher Dr. ΞChen warned: "There is no shortcut to solve this issue. Governments really need to take concrete measures to reduce air pollution."
Source: www.independent.co.uk (adapted)
According to the text I about “Air Pollution”, choose the incorrect alternative.
