Heart patients who exercise outdoors and deep-bretahe polluted city air are likely to do themselves harm, say researchers at the University of North Carolina. To study effects of polluted air on heart activity, 41 heart patients were first asked to work out for an hour on a busy city street where air was polluted with car exhaust fumes etc.The they worked out on stationary bikes in clean indoor air.

On day two of the experiment, they spent an hour in clean air and then did their bike exercise.

Comparing data, researchers found that dirty air increased the bikers arrhythmia that is, irregular heart beats – significantly.More arrhythmia means increased risk of heart attack.

Heart patients or not, everone should try to exercise in clean air. If you can find some!