Do I Need Sunscreen Indoors?
Last Updated: February 2026 · 3 min read
It depends on your window situation. If you sit within 1–2 meters of a window for more than 30 minutes during daylight hours, yes — wear sunscreen. UVA rays (the aging rays) penetrate glass. If you work in a windowless room or are far from windows, you can generally skip indoor sunscreen. Blue light from screens does NOT cause meaningful skin damage — don't fall for that marketing.
When You Need Sunscreen Indoors
Sitting near windows: UVA rays penetrate standard glass. If sunlight hits your skin through a window, you're accumulating UV damage.
Using photosensitizing products: If you use retinol, AHA, or BHA at night, your skin is more UV-sensitive the next day — even indoor UV matters more.
Treating hyperpigmentation: If you're actively treating dark spots or melasma, any UV exposure (however small) can reverse your progress.
When You Can Skip It
No windows nearby: If you work in a windowless office or basement, UV exposure is effectively zero.
UV-treated windows: Some modern buildings use glass that blocks both UVA and UVB. If confirmed, indoor SPF is unnecessary.
Minimal skin concerns: If you're not using actives and aren't treating specific conditions, occasional indirect indoor UV exposure won't cause noticeable damage.
Sola AI checks your location's UV index daily and recommends SPF application only when conditions require it — including adjusting for indoor vs outdoor time.
Frequently Asked Questions
Current research suggests blue light from screens has minimal impact on skin. The intensity is far lower than sunlight exposure. Don't buy "blue light protection" products — the science doesn't support the marketing claims. Focus on UV protection instead.
Standard window glass blocks most UVB (sunburn rays) but allows approximately 75% of UVA (aging rays) to pass through. Some car windows and laminated glass block more UVA, but unless your windows are specifically UV-treated, assume UVA is penetrating.
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