CLL	Chronic lymphocytic leukemia
COPD	Chronic obstructive pulmonary disease
ddPCR	Droplet digital PCR
DNA	Deoxyribonucleic acid
EC	Elemental carbon
IHD	Ischemic heart disease
LC	Lung cancer
LPG	Liquid petroleum gas
miRNA	MicroRNA molecule
NGS	Next generation sequencing
NSCLC	Non-small cell lung cancer
PAH	Polycyclic aromatic hydrocarbon
PM	Particle matters
pre-miRNA	Precursor miRNA
pri-miRNA	Primary miRNA
qRT-PCR	Quantitative real-time polymerase chain reaction
RISC	RNA-induced silencing complex
RNA	Ribonucleic acid
SCLC	Small cell lung cancer
VOC	Volatile organic compound
WHO	World Health Organization