Editing Person-days above heat threshold (section)

== Geographic / System Context ==
This signal applies globally, encompassing diverse geographic regions including urban, rural, and peri-urban areas where human populations reside. Geographic variability in climate, population density, and socio-economic factors influences the distribution and magnitude of person-days above heat threshold. Regions prone to heat waves, such as parts of North America, Europe, Asia, and Africa, often exhibit higher values of this signal due to both climatic conditions and population exposure patterns. Urban heat islands can locally amplify heat exposure, increasing the signal magnitude within metropolitan areas. The global scope allows for comparative assessments across different environmental and demographic contexts.