名词
中文翻译：排放浓度
同义词：
['emission rate', 'emission level']
例句：
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1.The factory has to reduce its emissions to comply with the new regulations.
工厂必须减少排放以满足新的法规。
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2. The study found that the concentration of pollutants in the air was higher than expected.
研究发现空气中污染物的浓度比预期的要高。
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3. The government is working on a plan to improve the emission concentration in the city.
政府正在制定一个计划来改善城市中的排放浓度。