With the exception of a reduced number of low concentration hits for phthalate compounds and , in one case, a trihalomethane compound, only halocarbons were reported in 1997.

• 根据1997年的采样数据，在各个采样中，只检测到浓度较低的酞酸盐化合物、三卤代甲烷化合物（只有一例）和卤烃。