Dimmick W F
Environ Health Perspect. 1981 Oct;41:203-6. doi: 10.1289/ehp.8141203.
Before development of an emission standard for vinyl chloride, the Environmental Protection Agency (EPA) conducted three programs to measure vinyl chloride (VC) concentrations in air around plants which either manufacture VC or use it. A brief monitoring survey conducted by EPA Regional Offices found VC in ambient air around poly(vinyl chloride) (PVC) production plants. As a consequence of this survey, a second monitoring program was established to measure VC in the air around VC and PVC production plants. This program found some relatively high concentrations of VC in ambient air around the plants. This program found maximum 24-hr average rations concentrations ranging from 0.32 to 10.6 parts of VC per million parts of air. The program also found an apparent relationship between certain emission excursions and ambient VC concentrations. A third monitoring program was established to measure VC around PVC fabrication plants. This monitoring program found much less VC around PVC fabrication plants than around VC and PVC production plants. In conclusion, VC was found in ambient air around VC production plants and PVC fabrication plants. However, the data show that much less VC escapes into surrounding air from PVC fabricating plants than from VC and PVC production plants.
在制定氯乙烯排放标准之前，美国环境保护局（EPA）开展了三项计划，以测量制造或使用氯乙烯（VC）的工厂周围空气中的氯乙烯浓度。EPA区域办公室进行的一项简短监测调查在聚氯乙烯（PVC）生产厂周围的环境空气中发现了氯乙烯。作为这项调查的结果，又设立了第二项监测计划，以测量氯乙烯和聚氯乙烯生产厂周围空气中的氯乙烯。该计划在工厂周围的环境空气中发现了一些相对较高浓度的氯乙烯。该计划发现24小时平均浓度最大值在每百万份空气中含有0.32至10.6份氯乙烯之间。该计划还发现某些排放波动与环境氯乙烯浓度之间存在明显关系。设立了第三项监测计划，以测量聚氯乙烯制造工厂周围的氯乙烯。该监测计划发现，聚氯乙烯制造工厂周围的氯乙烯比氯乙烯和聚氯乙烯生产厂周围的要少得多。总之，在氯乙烯生产厂和聚氯乙烯制造工厂周围的环境空气中发现了氯乙烯。然而，数据表明，从聚氯乙烯制造工厂逸出到周围空气中的氯乙烯比从氯乙烯和聚氯乙烯生产厂逸出的要少得多。
