This is also a good question. We have experience with this. The vacuum pump maintains a vacuum in the entire piping system during the operation of the machine and the discharge usually vents into the facility. You have to minimize the emissions and a lot of machine companies offer an activated carbon drone that you can connect to the exhaust of the vacuum pump. This allows you to pass the emissions test. We have had experience with this for a couple companies in Southern California and adding this carbon drone actually helps maintain the low 50grams per Liter VOC’s.