from journal Lancet
Air pollution in some cities is enough to counter health benefits of exercise in people over sixty. Research published in the journal Lancet showed short-term exposure to air pollution from busy city streets may be enough to negate positive effects on hearts and lungs gained from walking. Although previous studies have shown certain types of air pollution worsen airway diseases, such as asthma, this study is the first to show harmful effects in healthy people. Those with chronic lung conditions and coronary heart disease were also included in the study. Researchers conclude that if older people are going to walk for exercise—which is a good idea—they do it in a green area, such as a park, and away from traffic pollution.