If you’re stuck in traffic, keep your car’s A/C running. It could protect your heart! Researchers found when drivers kept the air on during a two-hour commute, they had a 32% increase in heart-rate variability, which is a measure of cardiovascular health. That’s compared to people who kept their windows rolled down instead. The reason? Because the A/C filters out exhaust particles spewing from the cars around you. Those pollutants trigger inflammation in the body, and it’s why being in heavy traffic triples your risk of heart attack within one hour.

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