PM	particulate matter
NO2	nitrogen dioxide
NOx	nitrogen oxides
NAFLD	non-alcoholic fatty liver disease
MAFLD	metabolic-associated fatty liver disease
MR	Mendelian randomization
UVMR	univariable Mendelian randomization
MVMR	multivariable Mendelian randomization
GWAS	Genome-Wide Association Study
SNPs	single nucleotide polymorphisms
IVs	instrumental variables
OR	odds ratio
CI	confidence interval
UKB	UK Biobank
MRC-IEU	UK Medical Research Council Integrative Epidemiology Unit
EGCUT	Estonian Genome Center of the University of Tartu
STROBE-MR	Strengthening observational studies using Mendelian randomization
MR-RAPS	MR-Robust Adjusted Profile Score
MR-PRESSO	MR-Pleiotropy RESidual Sum and Outlier
mre-IVW/IVW-mre	multiplicative random-effects inverse variance weighting