If you’re talking about pillows, laundry, or bedding, that’s because sunlight and fresh outdoor air can make fabrics smell noticeably fresher.
- ☀️ Sunlight can reduce some odor-causing microorganisms on exposed fabric.
- 🌬️ Air circulation helps moisture evaporate, and dampness is a major contributor to musty smells.
- The familiar “fresh laundry” smell after sun-drying is partly the result of volatile compounds changing or dissipating as the fabric dries.
For pillows and bedding, a few hours of sun can be helpful, but sunlight isn’t a substitute for washing. Don’t leave delicate or colored fabrics in strong direct sun for too long, since UV exposure can fade or weaken some materials.
If you meant something specific by “they,” tell me what you’re referring to and I’ll explain why it smells better in the sun.
