The EHC 152 (1994) stresses the lack of available monitoring studies from areas outside Michigan, as few human monitoring data are available for the US population outside of Michigan.
环境健康标准152（1994年）强调，因为有关密歇根州以外美国人口的人类监测数据很少，所以缺少对密歇根州以外地区的可用监测研究。