Fig. 1
Principal components analysis concept for Environmental Quality Index (EQI). Performed for all counties and each of the four strata of the rural–urban continuum (RUCC) codes [22]
Fig. 1 | Environmental Health
Principal components analysis concept for Environmental Quality Index (EQI). Performed for all counties and each of the four strata of the rural–urban continuum (RUCC) codes [22]
Environmental Health
