About 9 percent of vehicles in Prague with the highest emissions produce 60 percent of the air pollution particles, according to results of a Czech Technical University (ČVUT) study.
The study confirmed that the most important source of air pollution in Prague is road transport and associated emissions from fuel combustion. Most problematic are the ultra-fine particles from diesel-powered vehicles that contain cancer-causing substances.
The most polluting vehicles were found to lack particle filters or have inoperative filters. Drivers with engine trouble often bypass the filter rather than fix the main problem with the engine.
Read the full article here (via Prague.TV)