The integrated pollution indexes decreased obviously in wells 1#,2#,4#,6# and 7#, which indicated thad the extent of pollution were lower than that in 2000.

• 综合污染指数P在监测井1~%23、2~%23、4~%23、6~%23和7~%23均有明显的减小,反映其污染程度减轻。