Not only are traffic jams a total rage-inducing drag, but new scientific studies have confirmed they are also bad for our health. Sitting in a bumper-to-bumper gridlock multiplies the toxicity of air pollution, especially when windows are rolled down or fans are circulating outdoor air inside the vehicle. Luckily, taking a few simple steps will reduce your risk of exposure. Researchers from the University of Surrey have published studies over the last two years highlighting the risks of sitting in traffic.