Petroleum contamination in groundwater/air and its effects on farmland soil in the outskirt of an industrial city in China

► Biogenic and various petrogenic hydrocarbons were identified in water and air. ► Pollution and degradation of water were heavier in October than those in May. ► For air, pollution was lightest in winter and heaviest during summer and autumn. ► Various hydrocarbon concentrations and compositions were identified by PCA. ► We found the effect of irrigation water on soil was higher than that of air by RDA.