BACKGROUNDOdorous gases, derived from organic decomposition in the soil, frequently cause odor nuisances, seriously affecting the daily life and health of surrounding residents. In the past, reports mostly focused on the analysis of toxic and hazardous substances in the site, and less attention was paid to the problem of site odor pollution.

OBJECTIVESTo predict the odor pollution of an organophosphorus pesticide site during the restoration, clarify the characteristics of odor pollution emission in the control area, and assess the human health risk of the pollution of the air near the soil.

METHODS7 potential odor pollution control areas were selected as the research objects, and the pollution degree and impact range of the nearby soil air odor was analyzed. Sensory analysis, gas chromatography high-resolution mass spectrometry (GC-HRMS) and reference concentrations (RfC) and inhalation slope factor (SF) were used.

RESULTSThe air near the soil in 7 areas showed different degrees of pungent odors with the odor concentration (the dilution multiple required to dilute the odor gas with odorless air to just no odor) ranging from 309 to 72443. The odor in the production area had the largest impact range, reaching 3.2km; a total of 209 volatile organic compounds (VOCs) in the ambient air near the soil, and 246 VOCs and semi-volatile organic compounds (SVOCs) in the soil samples were identified, mainly including aromatic compounds, halogenated substances, alkanes and oxygenated organics; the main odor contribution types included organic sulfides, aromatic compounds and oxygen-containing organic matter; 7 areas near the soil and air all had carcinogenic risks (>1.0×10^-4), and 5 areas had non-carcinogenic risks. The main carcinogens were 1, 4-dichlorobenzene, benzene, and carbon tetrachloride.

CONCLUSIONSThe results of the continuous study on the analysis of odor components and the risk of disease and cancer in pesticide sites provide an important basis for the restoration of the ecological environment and the health protection of residents in the study area.