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How does sunscreen work?

People are advised to drink plenty of fluids, wear lightweight, light-coloured clothing, and a wide-brimmed hat, and to use a high-factor sunscreen when a heatwave occurs.

Most of us are familiar with sun protection factor (SPF), the big number on the front of your sunscreen bottle. The higher the number is, the greater protection it offers.

SPF tells you how much protection your sunscreen provides from UVB radiation. Ultraviolet A and B refer to different wavelengths of radiation from the sun that enter the earth's atmosphere.

UVA is associated with ageing of the skin and pigmentation as well as skin cancer, particularly squamous cell carcinoma (the second most common type). It can affect human skin even through glass.

查看中英双语全文，微信关注“可可英语晨读”公众号。关注即可【加入晨读打卡学习群、领取双语全文pdf笔记，还能提前锁定免费直播课名额】。更多更快更精彩的内容，尽在“可可英语晨读”公众号。