As the Golden Week holidays begin on April 29, many people are heading outdoors. But spring sunshine can be deceptive—ultraviolet (UV) rays are already strong, and proper sunscreen use is essential.
A common misconception is that SPF (Sun Protection Factor) directly indicates how long you can stay in the sun. In fact, SPF 1 provides protection for about 15 minutes. So an SPF 30 sunscreen theoretically protects for 30 × 15 minutes = 450 minutes (7.5 hours), but this only holds under ideal conditions. Sweat, water, rubbing, and uneven application drastically reduce effectiveness.
How to apply sunscreen correctly:
- Use enough product: about a teaspoon for the face and a shot glass full for the body.
- Apply 15–30 minutes before sun exposure.
- Reapply every two hours, or immediately after swimming or sweating.
- Don't forget often-missed spots: ears, back of the neck, feet, and lips.
Choosing the right sunscreen:
- For daily urban use, SPF 15–30 is sufficient.
- For outdoor activities, use SPF 50+ with broad-spectrum (UVA/UVB) protection.
- Water-resistant formulas are better for sports or beach days.
Even in April, UV levels can be high. Don't let the mild temperature fool you—sun protection is a year-round necessity.