What is the role of GIS in environmental health practice?

• A. It creates toxicology reports
• B. It maps spatial data and supports exposure assessment, hazard mapping, resource allocation, and disaster planning
• C. It replaces field sampling
• D. It regulates radiation exposures

Answer: (B)

Geographic Information Systems are a powerful tool environmental health practitioners use to map where people, hazards, and resources intersect and to visualize how exposures and risks are distributed across space. By layering data such as pollutant concentrations, land use, population demographics, housing, infrastructure, and weather, GIS helps estimate who is exposed to what in which locations, supporting exposure assessment. It also supports hazard mapping by showing areas at higher risk for events like floods, heat waves, or pollution plumes, which informs prevention and response planning. For resource allocation, GIS guides where to deploy personnel, equipment, and interventions and helps optimize sampling strategies and evacuation routes. In disaster planning, it enables scenario modeling and helps coordinate logistics and outreach to vulnerable communities.

Toxicology reports are generated from exposure and effect data in toxicology and epidemiology, not from spatial mapping. Field sampling remains essential to obtain real-world measurements and validate models, so GIS does not replace sampling. And while GIS informs decisions that lead to protective regulations and actions, it does not regulate radiation exposures by itself.