Researchers from the IUF-Leibniz Research Institute for Environmental Medicine have discovered that long term exposure of even low levels of air pollution in infants can lead to reduced lung function when they grow up. They found that air pollution exposure in the first year reduced lung development and functioning from the ages of six to 15. This was true for even pollution levels below EU standards and the study included 915 children from Germany. The WHO limit for PM2.5 is an annual average of 10 µg/m3, and the EU limit is 25. Another Danish study, presented at the same conference, found that adult exposure to even low levels of air pollution increases the likelihood of asthma by 23 per cent.