Being kind to your lungs may help protect your arteries, too.

Long-term exposure to particulate matter (PM) pollution in city air not only is bad for the respiratory system, but research suggests it may hurt people's arteries, too. Be kind to both body systems by limiting time outdoors during high pollution times, such as during rush hour or on days when the weather report indicates high PM counts.

Particulate matter (PM) is comprised of fine bits of airborne pollution, including dirt, dust, and smoke from vehicle emissions, industrial processes, and construction. PM has long been known to be a health hazard to lungs. These particles are small enough to become lodged deep within the lungs where they can lead to breathing problems, especially for people who have asthma or a weakened immune system. Now, a growing body of evidence is pointing to the negative effects of PM on heart and arterial health. Reduce your exposure to PM by avoiding high-traffic areas during walks and jogs and by planning outdoor activities for days when the PM count is low. Also, air filters in your home or office may be helpful. Choose filters capable of removing particles 0.3 microns in size or larger.

Ambient air pollution and atherosclerosis in Los Angeles. Kunzli, N., Jerrett, M., Mack, W. J., Beckerman, B., LaBree, L., Gilliland, F., Thomas, D., Peters, J., Hodis, H. N., Environmental Health Perspectives 2005 Feb;113(2):201-206.