中新真探：防晒指数越高，防晒霜效果越好吗？
炎炎夏日，防晒霜成为人们的必备品。不少人认为，防晒指数越高，防晒效果就越好，因此往往选择高倍数的防晒霜。但事实真的如此吗？
中新网记者近日采访专家了解到，防晒霜的防晒指数，通常指的是日光防晒系数(SPF)，它是衡量防晒产品对防护紫外线能力的一个标准，但并非越高越好。
SPF30与SPF50，差别并不大
SPF值越高，代表防晒霜阻挡紫外线B (UVB) 的能力越强，但并非线性关系。SPF30的防晒霜能阻挡约97%的UVB射线，而SPF50的能阻挡约98%的UVB射线，二者的差别并不大。
高倍数防晒霜，并非“万能”
专家指出，防晒系数越高，往往添加的防晒剂浓度也会越高，反而会更加油腻、厚重，更容易造成皮肤毛孔阻塞的现象，影响肤感和体验。此外，高倍数防晒霜并非“万能”，它只能阻挡UVB，无法完全阻挡UVA。
科学防晒，才是关键
专家建议，选择防晒霜时，应根据自身肤质和户外活动时间选择合适的防晒指数。一般来说，日常通勤可以选择SPF15-30的防晒霜，户外活动时间较长或阳光强烈时可以选择SPF30-50的防晒霜。
此外，除了选择合适的防晒霜，还要注意以下几点：
- 涂抹均匀，不要遗漏任何部位。
- 每隔2-3小时补涂一次。
- 防晒霜并非“万能”，外出时还应采取其他防晒措施，如戴帽子、穿长袖衣物等。
科学防晒，才能有效保护皮肤，远离阳光的伤害。
英语如下：
Is Higher SPF Always Better? The Truth About Sunscreen
Keywords: SunProtection Factor, SPF30, SPF50
Content:
Withsummer in full swing, sunscreen has become a staple for many. Many believe that the higher the SPF, the better the protection, often opting for high-SPF sunscreens. But is this really true?
Recently, China News Service interviewed experts to understand the truth behind SPF. The Sun Protection Factor (SPF) measures a sunscreen’s ability to block ultraviolet B (UVB) rays, but higher isn’t always better.
SPF30 vs. SPF50: Not Much Difference
A higher SPF indicates a stronger abilityto block UVB rays, but it’s not a linear relationship. SPF30 sunscreen blocks about 97% of UVB rays, while SPF50 blocks about 98%. The difference between the two is minimal.
High SPF Sunscreens Aren’t “Magic”
Experts point out that higher SPF often means higher concentrations of sunscreen agents, making the product more greasy and heavy, potentially clogging pores and affecting skin feel and experience. Additionally, high SPF sunscreens aren’t a “cure-all,” as they only blockUVB rays, not UVA.
Scientific Sun Protection is Key
Experts recommend choosing the appropriate SPF based on your skin type and outdoor activity time. For daily commutes, SPF15-30 is generally sufficient. For extended outdoor activities or intense sunlight, SPF30-50 is recommended.
Beyond choosing the right sunscreen, remember these tips:
- Apply evenly, covering all areas.
- Reapply every 2-3 hours.
- Sunscreen isn’t a magic bullet. When outdoors, use additional sun protection measures like hats and long-sleeved clothing.
Scientific sun protection is the best way to safeguard your skin and avoid sun damage.
【来源】http://www.chinanews.com/life/2024/08-23/10273861.shtml
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