How are gases filtered during a cremation? Gasses and dust are filtered by the DFW Europe cremation filtration system. To know what is stated in your local air legislation. This can be different per country, so ask your local legislator for the emission rates. But general in the most European countries we handle the lowest emission values. This makes that European crematories are the greenest in the world. And these days we can write that extra innovations are made to make it possible for crematories to become even more environmental friendly because of their energy storage or re-usage of heat that can make become electricity. That can be delivered back to the electricity grid. So that the carbon footprint of a cremation can be reduced. And a crematorium can has corporate social responsibility CSR.