Câu ví dụ #1
1. Also known as “sunburn for the lungs”, ozone is caused by the interaction of sunlight with nitrogen oxides and the vast amounts of uncontrolled volatile organic compounds (VOCs) produced by burning fossil fuels.
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2. Ozone is one of six components of China’s official air quality index, along with sulfur dioxide, nitrogen oxides, carbon monoxide, PM2.
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