Schema reference
HomeNHealthy data dictionary
Field definitions, units and null semantics for the downloadable release.
| Field | Type | Definition |
|---|---|---|
rank | integer / null | National position among cities with every weighted component available. |
score | number / null | Experimental v2 score. Null means withheld, not zero. |
air.status | enum | available, stale or unavailable. |
air.aqi | integer | Current AirNow area AQI; not included in the index. |
water.active_cws | integer | Active community water systems returned for the state. |
water.health_violation_cws | integer | Systems returned by the current health-based-violation filter. |
water.without_current_health_violation_pct | number | 100 × (1 − violation systems / active systems). |
climate.moisture_pressure | number | 0–100 HomeNHealthy warm-season climate proxy. |
climate.warm_avg_f | number | May–September mean temperature from NOAA normals. |
climate.warm_precip_in | number | May–September precipitation total from NOAA normals. |
housing.median_year_built | integer | ACS B25035 place estimate. |
housing.pre_1980_housing_pct | number | Share of B25034 units in bins before 1980. |
housing.pre_1940_housing_pct | number | Share of B25034 units in the 1939-or-earlier bin. |
Null is not zero
A null or “Unavailable” value means HomeNHealthy could not publish a defensible observation. It must not be interpreted as no pollution, no violations, no rain or no older housing.