District Rule 4662 – Organic Solvent Degreasing Operations, was developed to help reduce emissions of volatile organic compounds (VOC) and hazardous air pollutants produced from degreasing operations, in which an enclosure or device is used for removing dirt, oil, grease and other contaminants. Effective September 21, 2008, the VOC content of cleaning solutions used in most degreasing operations is limited to 25 grams of VOC per liter of solution.
Petroleum-based solvents, such as mineral spirits, contain VOCs that evaporate into the air during the cleaning process. These emissions contribute to smog formation and may be toxic when inhaled. Using low-VOC cleaning materials can help reduce smog, operating costs, and worker exposure to hazardous chemicals.