The Complete Book of 100,000 Reasons Why
Favlit. ten thousand reasons why
为什么阴天紫外线依然存在？
简单的摘要：阴天紫外线依然存在的原因主要是紫外线穿透力强、云层对紫外线吸收不完全以及地面反射。
1、紫外线穿透力强：紫外线波长较短，能量较高，具有一定的穿透能力，即使有云层遮挡，部分紫外线仍能穿透云层到达地面。
2、云层对紫外线吸收不完全：云层虽然可以阻挡部分紫外线，但并不能完全吸收所有紫外线。部分紫外线会被云层散射，但仍会有一部分透过云层。
3、地面反射：到达地面的紫外线会发生反射，即使阴天，地面反射的紫外线也会增加环境中紫外线的强度。
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