Application of Nutech Remote Trigger Sampling Device and Pre-concentration System in Odor Monitoring Background Odor​ refers to any foul-smelling gas that irritates the olfactory system, causing discomfort and impairing the living environment. It primarily comprises six major categories of compounds: ​Aromatic hydrocarbons​ (e.g., benzene, toluene, ethylbenzene); ​Oxygenated compounds​ (e.g., phenols, alcohols, ketones, aldehydes); ​Alkanes