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Currently, an estimated 9,500 people die in London each year because of long-term exposure to air pollution. The main air pollutants causing problems in cities are nitrogen oxides (NOx), which includes both nitrogen oxide and nitrogen dioxide, and particulate matter (PM25). These pollutants are invisible but very harmful and are known to worsen illnesses such as asthma, lung and heart disease, particularly for children. A government advisory group has estimated that removing fine particulate matter from the atmosphere would increase life expectancy by an average of 6 months.
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