Study on the characteristics of air particulate from a petrochem ical com plex industrial site in the Southwestern Beijing

At petrochemical complex industrial sites in the southwestern suburb of Beijmg，oil has been the major energy source．The air particulate samples were collected separate!y for 3-4 consecutive days every month．The results showed that there are apparent correlations among monthly changes of weight of extracts，their mutagenicities and concentrations of PAHs．The weights for the day-time samples were higher than those for the night-time．Wights of extracts．revertant numbers．BαP concentration etc．were all lower for the petrochemical complex industrial site(PCIS)than for iron-steel complex site(ISCS)．However，mutagenicities per unit weight of extracts were higher for PCIS than for ISCS．