Car air fresheners seem harmless — but they are something I personally avoid. Most car fresheners work by continuously releasing fragrance chemicals and solvents into a very small, enclosed space. That means you’re breathing them in every time you drive. What concerns me as an oncology provider isn’t one-time use — it’s daily, long-term exposure layered over years. What many air fresheners may contain: • “fragrance/parfum” (umbrella term for undisclosed chemical blends) • volatile organic compou