Abstract: In order to study the emission characteristics,regularity and influence of volatile organic compounds (VOCs) from the petrochemical industry, VOCs in the air arounda petrochemical industrial park in North China was monitored, and environmental risks and human health riskswere assessed. The results showed that main VOCs in the air were alkane and olefin, and the VOCs in most of the sampling sites were low in content, and similar in composition and no obvious characteristic pollutants. The VOCs content around some sampling sites such as air flotation tank and ethylene plant was higher, and the VOCs composition were obviously affected by the devices emission. In general, low carbon alkanes such as ethane,propane and butane, and low carbon olefins such as ethylene and propylene were the main species in the petrochemical industrial park. The generation of ozone was mainly contributed by olefin, andpropylene, ethylene, propane, toluene, m/p-xylene and other compounds were the key active species. Aromatic hydrocarbons such astoluene, m/p-xylene, benzene and o-xylene were the main components contributing to the formation of secondary organic aerosol (SOA). The results of health risk assessment showed that VOCs in the ambient air of the petrochemical industrial park did not have a high carcinogenic risk to the employees,and the non-carcinogenic risk was low.

Key words: petrochemical industrial park, volatile organic compounds, emission characteristics, ozone formation potential, secondary organic aerosol formation potential, health risk assessment