places with low levels of tiny particles of air pollution called Particulate matter, the risk for MS was lower than in areas where those levels were high. In urban areas, the risk was 29% higher than in rural areas.
from WebMD Healthhttps://img.webmd.com/dtmcms/live/webmd/consumer_assets/site_images/article_thumbnails/news/2014/11_2014/air_pollution/650x350_air_pollution.jpg https://ift.tt/2XAb0I6
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