Vulnerability is not static. An encampment may have low COVID-19 rates one month (due to outdoor ventilation) but high heat-stroke risk the next. Real population health requires integrating climate data, housing data, and infectious disease surveillance in near-real-time.

These journals frequently publish free-to-read articles on population health:

Implementation of health-focused interventions in vulnerable ... - PMC

A curated directory of high-quality, peer-reviewed open access journals. Search for "Population Health" to find journals like Population Medicine that offer free access to all their content.

If you are new to population health and want to understand vulnerable populations in your region (or globally) using free online tools:

Exploring population health and the unique needs of vulnerable groups is essential for anyone interested in public health, nursing, or social policy. Fortunately, numerous high-quality educational materials, textbooks, and research databases are available online at no cost. 1. Free Online Textbooks

: An essential resource for understanding how diseases spread and how health outcomes are tracked across different populations.

Use PolicyMap free tier or CDC PLACES to overlay poverty, food access, health insurance rates, and mental health provider shortages.