大气中的挥发性有机物是空气中影响人体健康的重要污染物,它们在光化学烟雾、酸雨、全球变暖等环境 问题中也起到重要作用。使用傅里叶变换红外光谱测量了奥运期间首都机场C[EQUATION]H[EQUATION]浓度变化,通过最小二乘法拟 合得到C[EQUATION]H[EQUATION]在不同时间段内的浓度值。C[EQUATION]H[EQUATION]/C[EQUATION]H[EQUATION]值的变化趋势是晚上较高,白天较低,受汽车尾气影 响。C[EQUATION]H[EQUATION]浓度变化则是受机动车和飞机尾气的共同影响。奥运会期间C[EQUATION]H[EQUATION]浓度变化受飞机影响很 大,浓度变化和飞机架次相关性很好。

In urban areas, volatile organic compounds are important ambient pollutants because of their detrimental effects on human health and their role in the chemistry of atmosphere as precursors of ozone and other oxidants. The concentration of C[EQUATION]H[EQUATION] was analyzed by Fourier transform infrared spectroscopy. The variation of the long-time trends of the C[EQUATION]H[EQUATION] concentrations in Beijing may be ascribed to the emission changes from the plane and the motor vehicle. During Beijing Olympic Games, the C[EQUATION]H[EQUATION] concentrations in Beijing Capital Airport may be ascribed to the emission changes of planes, and the C[EQUATION]H[EQUATION] concentrations have good relativity with the quantity of planes.