Scientists have revealed that air pollution may be responsible a significant reduction intelligence. Research conducted the World Health Organization (WHO) China showed that air pollution was responsible notable falls student test scores languages and arithmetic. The Chinese study is called, "The impact exposure to air pollution cognitive performance". It was published in a journal called, "Proceedings the National Academy of Sciences". The study took place a period of four years. Researchers analyzed verbal and arithmetic tests taken 20,000 people of all ages. They said: "Polluted air may impede cognitive ability as people become older."
Researchers say their study is a warning to the rest the world, especially to those who live cities. The WHO says over 91 per cent the world population live areas with toxic air. Air pollution is currently the fourth highest cause deaths worldwide. The researchers discovered that the longer people were exposed to polluted air, the greater was the damage to their intelligence. They equated the impact air pollution to losing a year's worth of education. For those aged over 60, this could be the equivalent several years lost education. Researcher Dr Xi Chen warned: "There is no shortcut to solve this issue. Governments really need to take concrete measures to reduce air pollution."