Changes to the occupational health and safety regulations for workers exposed to grain dust and flour dust in federally regulated workplaces take effect. The regulations will significantly lower the risk of workers coming into contact with airborne substances in the workplace, while ensuring consistency with most provincial and territorial regulations. These changes will also align the exposure limits for these hazardous substances with the highest safety standards in Canada and internationally. The Occupational Exposure Limit (OEL) for grain dust in the federal jurisdiction of 10 mg/m3 is higher than the limit recommended by scientific consensus to protect the health and safety of employees at risk. The OEL for grain dust will be decreased to 4 mg/m3.