Compound Health Signals
When multiple risks converge in the same place.
Most community health reporting looks at one factor at a time. We surface the counties where environmental exposure, chronic disease, healthcare access gaps, and social and economic vulnerability all show up together. These patterns are invisible in any single-source dashboard.
What is a compound health signal?
A compound health signal triggers when a U.S. county scores above a threshold on more than one of the four major health-risk areas at the same time:
- Environmental exposure: PM2.5, ozone, hazardous waste, drinking water, traffic, heat
- Chronic disease: chronic disease prevalence, mortality, cancer incidence
- Healthcare access: primary care and specialist supply against population need
- Social and economic conditions: food insecurity, housing, transportation, economic vulnerability
Single-factor reporting tells you that something is wrong. Compound signals tell you where multiple things are going wrong together, which is where strategic response tends to land hardest.
How detection works
Each of the four health-risk areas is scored on a 0–100 scale where 50 represents the U.S. average. Counties scoring 70 or higher on an area (worse than about 70% of U.S. counties) are above the threshold. A compound signal triggers in any county that's above the threshold on two or more areas at the same time.
You can tune the filter: change the threshold (anywhere from 50–95), require any number from 2 of 4 through 4 of 4 areas at the threshold, and filter by named patterns (see below). The result is a list of every U.S. county that matches, ranked by composite Opportunity Score.
Full weights, threshold derivation, and validation are in the Methodology.
Metro vs. rural: same framework, different signal shape
Compound signals don't only show up in rural counties or only in big metros. The same four-pillar framework surfaces radically different patterns at different scales:
Harris County, TX
Houston · pop. 4.7M
Industrial-corridor environmental load (refineries, ship channel) combined with chronic disease prevalence well above the national average. The county-level score hides tract-level severity in petrochemical-corridor neighborhoods, which shows up clearly in the tract drill-down.
San Augustine County, TX
East Texas · pop. ~7,800
A different signal shape entirely. Chronic disease and social and economic conditions are both above national averages, with a thin provider network and limited service-line capacity. The compound-signal framework surfaces the rural intensity that gets lost in raw-count reporting dominated by metro denominators.
Four named patterns
Beyond the generic “N of 4 dimensions elevated” filter, we publish four named compound patterns that bundle specific indicator combinations into a single named signal:
Respiratory Burden
High PM2.5 or ozone exposure combined with high COPD or asthma prevalence and a thin pulmonology workforce. Surfaces counties where respiratory care is structurally under-resourced for the local environmental load.
Wildfire Smoke Vulnerability
Recent wildfire smoke exposure combined with high respiratory and cardiovascular disease prevalence and social vulnerability. Used heavily by behavioral and respiratory health planners.
Heat Health Risk
High summer heat exposure combined with a larger elderly population, social vulnerability, and housing-quality stress. Surfaces counties where extreme-heat events translate to mortality.
Industrial Pollution Burden
EPA TRI, RMP, and Superfund proximity combined with high chronic disease prevalence and social and economic vulnerability. The compound signal that surfaces what petrochemical and industrial-legacy corridors look like at the county scale.
Why this matters for CHNAs and planning
Most CHNAs report each indicator separately and let the reader piece them together. That mostly never happens. The compound signal makes the convergence visible directly, in a format that a community-health committee, a board of directors, or a grant reviewer can act on without wading through a 200-page PDF.
Strategic response (service-line investment, mobile clinic placement, mitigation grants, advocacy targeting) has to be prioritized somehow. Compound signals give you a defensible, data-driven prioritization framework instead of intuition or whoever is loudest in the room.
See compound signals for your area.
The four-pillar single-county profile is free with email signup. Compound signal filters across multiple counties are part of the Pro tier.