CON	saline control
DEP	diesel exhaust particles
GI	gastrointestinal
HF	high-fat diet
IBD	inflammatory bowel disease
IL	interleukin
LPS	lipopolysaccharide
NF-κB	nuclear factor kappa B
MMP	matrix metalloproteinase
MUC2	mucin 2
MVE	mixed vehicle engine
OA	oropharyngeal aspiration
PM	particulate matter
PRO	probiotics
SBB	sudan black B
TJ	tight junction
TLR	toll-like receptor
TNF	tumor necrosis factor
WS	wood smoke
ZO	zonula occludens