慎防陽光中的三大皮膚殺手：UVA、UVB、紅外線！

UVA、UVB和UVC，這些簡寫對我們來說並不陌生，但我們未必了解所有防曬知識。現在讓我們解釋為何陽光不是您最好的朋友。
太陽光譜由電磁波組成，這些電磁波會穿透皮膚，為身體帶來益處，但同時會對身體產生有害的影響。我們持續處於不同波長的紫外線、紅外線等射線環境之下。當中紫外線來自陽光，並有以下三類，分別是UVA、UVB和較少人認識的UVC。無論任何天氣，大氣中的紫外線都無處不在。紫外線在中午至下午4時最為強烈，因此請盡量避免皮膚受到陽光直射，或使用合適的防曬產品來保護曝露在外的皮膚。UVC對皮膚的危害最大，但波長最短。由於有大氣層過濾以及臭氧層阻擋，UVC才無法到達地面。
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肌膚的頭號敵人：UVA

UVA波長較長，有95%的UVA輻射會到達地面。UVA全年都存在，即使在陰天，UVA亦會穿透雲層、玻璃和表皮。即使UVA不會帶來疼痛感，但能夠穿透皮膚，深入真皮細胞內部，會損壞細胞的DNA，引起曬傷、發炎、過敏和色素問題。UVA也是導致皮膚老化的元兇，它會削弱膠原蛋白網絡，令肌膚變得鬆弛，不再緊緻，更會產生皺紋。  
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肌膚曬黑的元兇：UVB

UVB波長中等，不能穿透皮膚表層。其強度在一天中變化不定，中午時最強，就算有雲層遮擋時亦然。UVB可影響肌膚表皮，刺激黑色素生成，令膚色變黑，從而保護肌膚免受陽光傷害。在48小時內，肌膚便會呈現持久的小麥色。同時，UVB亦會導致曬傷、過敏反應，甚至是皮膚癌的成因。
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