Unfiltered traffic-related air associated with immediate, significant blood pressure increase

A randomized crossover trial found that the inhalation of traffic-related air pollution while in a car with unfiltered air was associated with a 4.5 mm Hg increase in blood pressure. This change in blood pressure occurred rapidly, peaked within 60 minutes of exposure, and persisted over 24 hours. The findings are published in Annals of Internal Medicine.