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You know that urge you have to hold your breath when a car goes by, spewing exhaust? It’s a good instinct. Because when car exhaust reacts with sunlight, it creates ozone, which can cause breathing problems. And if we regularly breathe in exhaust, from rush hour traffic or jogging on a busy road, it can raise our risk for heart disease. So follow your instincts and hold your breath until the truck passes – and roll up your car windows during rush hour.