PM	Particulate matter
VF	Vocal folds
hVFF	Human vocal fold fibroblasts
NF-κB	Nuclear factor-κB
mRNA	Messenger RNA
IL	Interleukin
IκBα	Nuclear factor of kappa light polypeptide gene enhancer in B-cells inhibitor alpha
MAPK	Mitogen-activated protein kinase
ROS	Reactive oxygen species
ERK	Extracellular signal-regulated kinase
JNK	c-Jun N-terminal kinase
NAC	N-acetylcysteine
ECM	Extracellular matrix
TGF- β1	Transforming growth factor β1
Col1A1	Alpha-1 type I collagen
α-SMA	α-smooth muscle actin
H&E	Hematoxylin and eosin
RT-PCR	Quantitative real-time reverse transcriptase polymerase chain reaction
cDNA	Complementary DNA
GAPDH	Glyceraldehyde-3-phosphate dehydrogenase