Yes, diffusers are safe for cars when used correctly. The Hone Aroma Capsule Car Diffuser is specifically designed to be safe and effective in a vehicle environment. It releases essential oils in a controlled manner, ensuring that the fragrance is evenly distributed without overwhelming your senses. Additionally, the Capsule Car Diffuser is portable, spill-proof, and designed with safety in mind, making it an ideal choice for enhancing your car's ambiance without any risk