Moderate level of fine particle pollution is associated with a 56 per cent higher risk of developing Parkinson’s disease, new research in the US has found. Previous studies have shown that fine particulate matter, or PM2.5, can cause inflammation in the brain, which is a known mechanism by which Parkinson’s disease could develop. The researchers also found that the relationship between air pollution and Parkinson’s disease was not the same in every part of the country, and that it varied in strength by region…