Is the Sun’s Rays After 4 PM Still Harmful?
Meteorological and dermatological research indicates that the intensity of ultraviolet (UV) rays varies throughout the day. Between 10 AM and 4 PM, especially from April to August, UV rays tend to peak. UVB rays, the primary cause of sunburn and surface skin damage, are at their most intense during this period. However, even after 4 PM, UVA rays, which can penetrate deep into the skin and accelerate aging, remain present, albeit with reduced intensity.
From 10 AM to 4 PM, the UV rays are at their strongest and can cause the most skin damage.
Additionally, remember that surfaces such as glass, concrete, sand, and water can reflect and scatter UV rays, affecting your skin even when you’re not standing directly in the sun.
When Can Skin Take a Break from Sunscreen?
Your skin doesn’t always need to be covered in a thick layer of sunscreen. If, after 4 PM, you’re indoors, the outdoor light is weak, and you’re not exposed to direct sunlight or artificial light sources emitting UV rays (such as industrial halogen lamps), then your skin can take a breather.
After 4 PM, if you’re indoors and not exposed to reflected light from glass or UV-emitting devices, you can temporarily discontinue using sunscreen.
This doesn’t mean neglecting your skin. Instead, prioritize restoration during the evening. Reapplying sunscreen at this time, when your skin is no longer exposed to UV rays, can lead to a heavy, oily feeling, especially for those with oily skin or acne.
The afternoon and evening are ideal for cleansing, moisturizing, and using actives that can’t be used during the day due to sun exposure, especially for acne-prone skin.
This is also the perfect time for gentle exfoliation, deep hydration, and the application of antioxidants. Experts recommend using products containing niacinamide, panthenol, or gentle plant extracts to help skin recover from a day of exposure to pollution and UV rays.
When Should You Still Apply Sunscreen After 4 PM?
Whether you need to reapply sunscreen after 4 PM depends on the season, your location, and your daily activities. If you’re still going to be outdoors, walking, cycling, or working near large windows, reapplication is necessary to prevent cumulative skin damage.
After 4 PM, if you’re still outdoors or near windows, apply sunscreen and consider using physical protection as UV rays are still intense at this time, even if the sun is less harsh.
Especially for those with sensitive skin or undergoing treatment for hyperpigmentation, or post-peel or laser procedures, maintaining a thorough sunscreen routine in the late afternoon is crucial as the skin is more photosensitive and prone to damage.
Individuals undergoing intensive treatments with tretinoin or skin peeling should also maximize sun protection with sunscreen.
A simple way to decide is to check the actual UV index for the day using weather apps. If the UV Index is 3 or higher and you plan to go outside, reapply sunscreen, even in the late afternoon.
Note
If your work or schedule requires you to go outdoors after 4 PM, and the UV index is moderate to high, reapply sunscreen. However, instead of applying a thick layer or using a matte finish product (which can clog pores later in the day), opt for a lightweight, milk or gel-based sunscreen with moisturizing properties.
The texture of sunscreen also plays a significant role in how your skin feels throughout the day.
Additionally, combining physical protection measures such as wearing a wide-brimmed hat, long-sleeved clothing, sunglasses, or a sun-protective mask can effectively reduce the burden on your skin while maintaining protection.
Physical protection measures provide an effective way to reduce the oily feeling while maintaining sun protection.
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