Sun protection · 16/06/2026
Why a long daily commute by car is a genuine, often-ignored source of cumulative sun exposure
Car windows block most UVB but allow significant UVA through, meaning a regular long commute represents real cumulative photoaging-relevant exposure that "I was inside the car all day" doesn't actually rule out.
Why "I was in the car all day" doesn't actually mean meaningful UV exposure was avoided
Standard automotive glass blocks most UVB radiation but allows a significant proportion of UVA — the wavelength most associated with long-term cumulative photoaging — to pass through largely unimpeded, meaning a regular daily commute, particularly on the side of the car facing the sun, represents genuine cumulative UV exposure that simply being inside a vehicle doesn't actually prevent.
Why this driving-specific exposure pattern often goes completely unaddressed in typical sun-care routines
Many people apply sunscreen for outdoor plans but skip it on days consisting mainly of driving and indoor time, on the reasonable-seeming but ultimately mistaken assumption that being inside a car or building all day means UV exposure wasn't a relevant factor — missing the meaningful cumulative UVA dose a regular long commute actually delivers through unprotected car glass.
Maintaining consistent SPF on driving-heavy days specifically because of this car-window UVA exposure pattern
Apply sunscreen on any day involving a meaningful driving commute, regardless of whether the day otherwise involves significant outdoor time — the cumulative UVA exposure through car windows over a regular long commute adds up across months and years in a way that "I was mostly indoors or in the car" mistakenly suggests doesn't matter.
ROUND LAB Birch Juice Moisturizing Sunscreen SPF 50+ PA++++ 50ml — available on BuyBeautyKorea →
