EPA AirNow
Current, preliminary reporting-area AQI. Updated with each HomeNHealthy data run and kept outside the structural index.
Coverage: 75/75 cities · Definition and limitations
Primary-source catalog
Where HomeNHealthy data come from
Every source is a public agency dataset. HomeNHealthy’s contribution is the joined, interpreted city record.
EPA ECHO / SDWIS
Active community water-system counts and systems with current health-based violations, presently reported at state level.
Coverage: 75/75 cities · Definition and limitations
NOAA/NCEI Climate Normals
1991–2020 monthly station normals used for a transparent warm-season temperature and precipitation proxy.
Coverage: 75/75 cities · Definition and limitations
U.S. Census Bureau ACS
2024 five-year place estimates from B25034 and B25035: age bins and median year built.
Coverage: 70/75 cities · Definition and limitations