The tasks including on-site interviewing to 78 factories, NMHC continuously monitoring of 81 stacks, exhaust VOCs composition analysis of 32 stacks by GC/MS, and reviewing 789 investigation reports among 15 Counties or Cities, had been completed in the project. Data collected by NMHC emission monitoring show the amount of NMHC emission in each stack of five industries in turn are: print circuit board 0.002~9.940 kg/hr，PVC leather 0.361~138.940 kg/hr，rotogravure print 0.78~44.28 kg/hr，passive element 0.026~19.743 kg/hr，diode and transistor 0.02~3.66 kg/hr. It indicates that the amount of VOCs emission from conventional industries, like PVC leather and rotogravure print, is more than the other 3 industries because of the amount of organic solvent usage and poor VOCs abatement facility installing in the conventional industries. The major VOCs composition of the exhaust from five manufacturing processes can be analyzed by GC/MS, and the results are PGME, MEK and ethanol in print circuit board, toluene and MEK in PVC leather, MEK, toluene and ethyl acetate in rotogravure print，toluene and ethanol in passive element，n-butyl acetate, acetone and toluene in diode and transistor. It also shows major pollutants come from raw materials (no transformation). The emission factors of five manufacturing processes can be measured by applying mass balance calculation of VOCs in specific factories. Results show that the emission factors are 0.046-0.640 kg/m2-product in print circuit board，0.021-0.092kg/m2-product in PVC leather，0.136E-4-0.397 E-4kg/m2-product in rotogravure print，0.27-113.85mg/unit product in passive element, and 9.320-384.297kg/m2-product or 0.001-0.316 kg/1000 chips in diode and transistor. The variation of the emission factors in each manufacturing process is large because VOCs emission patterns caused by different processes, raw materials, or products are significantly different.

Solvent, VOCs Emission Inventory