New maps and data now available for the Relative Threshold Heat Index Days from the CDC National Environmental Public Health Tracking Network, 2022. ***PREM***

Data have been updated from 2017-19 to 2019-21 three-year average. We also updated the map layers of previous years (2014-16 and 2017-19) as the underlying data are updated and released by CDC National Environmental Public Health Tracking Network in 2022.

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