The mean environmental health hazard index of Butte County, ID was 99 in 2015. The mean environmental health hazard index of Mellette County, SD was 99 in 2015.
Median Environmental Health Hazard Index
The environmental health hazard exposure index summarizes potential exposure to harmful toxins including carcinogenic, respiratory, and neurological hazards. Values are percentile ranked and range from 0 to 100, with higher values corresponding to less exposure to harmful toxins. Data is computed for U.S. counties by applying summary statistics across all census tracts present in a county and is current as of 2015.