You roll your windows down while sitting in heavy traffic.
The WHO has uncovered that exposure to the fumes produced by burning diesel fuel can cause cancer in humans. After reviewing multiple studies, researchers found that diesel engine exhaust can cause lung cancer and potentially bladder cancer by triggering changes in DNA.
People most at risk of heavy exposure to diesel fumes include toll booth workers, truck drivers, miners, and construction workers, but keeping your car windows rolled up in areas of heavy standing traffic will help to limit your exposure.