In June I posted an article that cited research describing how exposure to traffic and air pollution was especially unhealthful for people with diabetes:Another Reason to Clean the Air
Here's a related study that appeared in the New England Journal of Medicine last October. It found that exposure to traffic just about tripled their subjects' risk for heart attack within an hour.
Time spent in cars, motorcycles, bicycles, or on public transportation consistently increased the risk for heart attack. Again, people with diabetes were found to be more susceptible.
It may not be possible to change your commuting routine. But in light of research that suggests traffic and poor air quality can compromise cardiovascular health, coupled with the recent need for energy conservation, it may be wise to consolidate errands and limit trips when you can.
Also, as one commenter said:
"We can't avoid all pollution, but sufficient use of antioxidants and a healthy diet with proper exercise should help."
For a summary of the study:
Sitting in Traffic Ups Risk of Heart Attack
For the study itself (abstract only, subscription required for full article):
Exposure to Traffic and the Onset of Myocardial Infarction
