Abstract: BTEX is a general designation of benzene, toluene, ethylbenzene and three xylene isomers (o-, m-, and p-xylene). Because of its wide existence in air, water, and soil environment, BETX has caused threat to related ecosystems and human health, being highly concerned by many relevant environmental agencies. In this paper, some environmental quality standards of BTEX were summarized. In addition, through the introduction of indoor air, surface water, and soil quality standards of BTEX formulated by developed countries (USA, Australia, and Canada) and international organizations (WHO and EU), and through the comparison of China’s standards with the former ones, some problems and shortcomings in China’s standards were pointed out. Finally, the future research on environmental quality criteria of BTEX was propounded.

Key words: Soybean (Glycine max L.), Allelopathy, Hydroxy phenylacetic acid