Between traffic and seemingly endless lights, you probably end up spending more time than you would probably like to admit in your car. Also thanks to lights and traffic (and humanity), sometimes our emotions tend to run highest while we’re driving. There’s also another issue—over time, the smell in our vehicles can seem stale or just plain funky. Fortunately, aromatherapy can provide relief for both problems. Address unpleasant odors and change the mood in your car with this easy DIY car oil diffuser or air freshener.