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Air pollution
空气污染
A: I've heard of ground-level ozone but can you explain what it is exactly?
A:我听说近地面臭氧，但是你能确切解释一下是什么吗？
B:Yes, it's one of the main air pollutants. Factories don't emit it directly into the air.
B:是，它一个主要的空气污染物。工厂不把它直接排到大气中。
It's actually formed when nitrogen oxides and VOC emissions come into contact with heat and sunlight.
它实际会形成一氧化氮，而且它在与光和热的接触下会释放出VOC。
A: Sorry? What does VOC stand for?
A:对不起？VOC代表什么？
B: Oh, VOCs are 'volatile organic compounds'. That's a technical term for solvents or other chemicals found in things like paint.
B:哦,VOCs是挥发性有机混合物。这是溶剂方面的一个专业术语，其它的化工品像油漆等也有这种物质。
A: So, what damage does ozone do to the environment?
A:那么,臭氧对环境有什么破坏？
B: Well, it can cause smog, which can affect people's health - especially people with breathing difficulties.
B:哦，臭氧会引起浓雾,影响人们健康，特别是会让人感到呼吸困难。
