Most diggers and construction machines discharge unfiltered exhaust fumes into the air. This is because special vehicles are made in small batches, and each requires a different filter geometry. Diesel soot filters of varying shapes can now be produced at competitive prices. Modern diesel cars are not only quieter than their predecessors but also release considerably fewer exhaust fumes into the atmosphere. The filters for heavy-duty, construction and off-road vehicles are not yet state-of-the-art. A new diesel particulate filter technology will soon teach even these vehicles to give up smoking.