人们对防晒霜最大的误解是长波紫外线。昆都表示,“长波紫外线随时都围绕着我们,它可以穿透窗户玻璃。”和中波紫外线一样,长波紫外线也与增加患皮肤癌的风险有关,但与中波紫外线不同的是,长波紫外线完全没有经过臭氧层的过滤。长波紫外线不会导致晒伤,“但会让皮肤变黑老化,因为它能更深入皮肤,对胶原蛋白产生更大影响”。
There’s only one way to tell whether your sunscreen offers UVA coverage: the words “broad spectrum.” Without the words “broad spectrum” your sunscreen likely doesn’t offer coverage from UVA, Kundu says.
只有一种方法可以判断你的防晒霜是否能够阻挡长波紫外线:那就是“广谱防晒”。昆都称,如果没有“广谱防晒”这个词,你的防晒霜可能无法抵挡长波紫外线。
Most active ingredients in sunscreen shield against UVB, but far fewer have UVA coverage, and only a handful offer both.
防晒霜中的大部分活性成分对中波紫外线具有屏蔽作用,但能屏蔽长波紫外线的成分却少得多,而只有少数几种成分能同时屏蔽两种紫外线。
Personally, Kundu uses an SPF 30 sunscreen with the active ingredient zinc oxide, a natural sunscreen ingredient that physically—instead of chemically—blocks rays. Zinc oxide protects against both UVA and UVB rays.
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