PM2.5	Fine particulate matter
HR	Hazard ratio
EPA	U.S. Environmental Protection Agency
NAAQS	National Ambient Air Quality Standard
CRF	Concentration response function
CMS	Centers for Medicare and Medicaid Services
MBSF	Master Beneficiary Summary File
ICD-10	International Classification of Diseases Tenth Revision
NO2	Nitrogen dioxide
O3	Ozone
SEDAC	Socioeconomic Data and Applications Center
SVI	Social vulnerability index
CDC	U.S. Centers for Disease Control and Prevention
RUCA	Rural-Urban Commuting Area
SES	Socioeconomic status
NAN	North American Native
OR	Odds ratio
USD	US dollar
COPD	Chronic obstructive pulmonary disease
SDOH	Social determinants of health
IHS	Indian Health Service