We all know that sunscreens are crucial during our beach vacations, sunny walks, and outdoor sports. But we often skip applying them when we are indoors. And probably, this is one of the most common misconceptions about sunscreens. In fact, it is a huge skincare mistake that we are making. The sun's rays contain harmful ultraviolet (UV) radiation, mainly UVA and UVB rays, that not only affects your skin outside but also behind the glass windows.
Though glass windows block most UVB rays, UVA rays can still pass through. That means if you spend hours near windows, are driving, or working in a bright office, your skin may still receive significant UVA exposure. Therefore, your skin does need sunscreen even when you're indoors.
Dermatologist Dr Madhuri Agarwal tells HT Shop Now, “I see many patients who are very diligent about sunscreen outdoors but completely skip it indoors. But your window panes are incapable of blocking the UVA rays, the ones responsible for pigmentation and early ageing, hence, it is crucial to apply sunscreen while you're at home”.
Blue light from screens, when used long-term, can cumulatively add to pigmentation. And suggests using a broad-spectrum sunscreen while working on a laptop as well to protect skin from photo damage and early signs of ageing.
Shaily Mehrotra, CEO & Co-Founder, Fixderma, also says, “The truth is that sun exposure doesn't stop at the doorstep. UVA rays can penetrate windows and continue to impact the skin even while you are indoors, particularly if you spend long hours near natural light."
She further says that if daylight reaches you through windows or you step outside during the day, daily sunscreen is a smart and easy habit for long-term skin health.
“This daily sun exposure can contribute to pigmentation, uneven skin tone and visible signs of premature ageing. While every skincare routine should reflect an individual's lifestyle and needs, consistent sun protection remains one of the most effective and scientifically backed steps for preserving the skin's long-term health and appearance”, she mentions.
Why UV exposure can happen indoors
UVA rays pass through windows: Standard glass blocks most UVB rays (the rays that cause sunburn), but a significant amount of UVA rays can penetrate windows. UVA contributes to:
- Premature ageing (wrinkles, sagging, dark spots)
- Hyperpigmentation
- Skin cancer risk over time
You may spend time near windows: If you work at a desk by a window, drive frequently, or sit in a bright room for hours, your skin can accumulate UVA exposure throughout the day.
Visible light can worsen pigmentation: For people prone to melasma or post-inflammatory hyperpigmentation, visible light (especially blue light and sunlight entering through windows) may contribute to darkening of pigmentation.
Consider wearing sunscreen indoors if
- You use skincare products that increase sun sensitivity (retinoids, AHAs, BHAs).
- You are treating pigmentation, melasma, or acne marks.
- You want to minimise long-term photoageing.
- You sit near windows for extended periods.
Tips to reduce sun exposure indoors
1. Stay away from direct sunlight through windows
- Sit a few feet away from windows when possible.
- UV intensity drops significantly as you move away from direct sunlit areas.
2. Use UV-blocking window films
- Many clear window films block 99%+ of UVA and UVB.
- This is especially useful if you spend long hours near a desk, bed, or couch by a window.
3. Keep curtains or blinds closed during peak sun hours
- Particularly between about 10 a.m. and 4 p.m.
- Blackout curtains provide the most protection.
4. Use laminated or low-E glass
If you have control over your home or office setup, these types of windows block much more UVA than standard glass.
5. Choose your indoor spot wisely
- Rooms with fewer or smaller windows receive much less UV exposure.
- North-facing rooms (in the Northern Hemisphere) generally get less direct sunlight.
6. Wear protective clothing
Long sleeves, tightly woven fabrics, or UPF-rated clothing can help if you're sitting near sunny windows for extended periods.
5 sunscreens to control UVA rays
For indoors, you need sunscreens that can block the UVA rays from penetrating the glass pane. Here are 5 sunscreens with UVA protection worth considering.
- What does SPF mean?
SPF (Sun Protection Factor) measures protection against UVB rays, which cause sunburn. For example, SPF 30 filters about 97% of UVB rays, while SPF 50 filters about 98%.
- Should I wear sunscreen every day?
Yes. UV rays can penetrate clouds and windows, so daily sunscreen use is recommended even on cloudy days.
- How much sunscreen should I apply?
For the face and neck, use approximately two finger lengths of sunscreen. For the entire body, most adults need about one ounce (a shot-glass amount).
- When should I apply sunscreen?
Apply sunscreen 15–30 minutes before sun exposure to allow it to form a protective layer on the skin.
- Can I skip sunscreen if my makeup contains SPF?
Makeup with SPF can provide some protection, but it's usually not applied in sufficient quantity. Use a dedicated sunscreen underneath.
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