在紫外线照射之前之后的图像显示，在防晒霜渗透至皮下后，皮肤的有害氧化反应增加了。
Images taken before and after exposure to UV radiation showed ROS generation in the skin increased after sunscreen penetration.
如今科学家们发现光污染几乎和二氧化碳污染一样有害。
Nowadays scientists are finding light pollution can be almost as bad as carbon dioxide pollution.
相反，燃烧轮胎会产生有害的污染物，二氧化硫。
Burning a tyre, by contrast, produces sulphur dioxide, a noxious pollutant.
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