The most obvious fix is to upgrade to a filtration media with higher efficiency. There are many good choices available, and a reputable filter supplier should be willing to guarantee in writing that the maximum emissions rate will fall below threshold limits established by OSHA or EPA for the dust in question.
Filtration efficiency is only part of the picture, however. Dust collector cartridges with open-pleated media tend to hold more dust between cleaning pulses and release the dust more readily during cleaning than filters with tightly-packed media. Most dusting and emissions problems occur during pulsing, so this difference in cartridge construction can make an impact. Also, a good electronic control system – programmed to provide “on demand” rather than continuous pulsing – will prevent over-cleaning of cartridges and reduce the chance for dusting to occur. As a side benefit, on-demand cleaning will save on compressed air and energy costs. For more information, read the article, Asking the Right Questions.