We all know that outdoor aerobic exercises like running and biking are good for your health. But during the hottest days of summer, it’s not just excess heat we have to worry about, but smog, the concentrated air pollution you can often see hovering over the cityscape. During the hot summer months, smog can become a serious health problem in the Boston area. We are often downwind from the Midwest’s coal-fired power plants as well as the East Coast’s major cities.