A levegő terhelése csökkenő tendenciát mutat, bár 2005-ben nyilvánvalóan történt valami változás a mérési módszerekben vagy a statisztikai nyilvántartásban.
Air quality has improved significantly since the regime, primarily owing to changes in industrial emissions. Caused by residential heating, the level of SO2 emissions also decreased. Major positive developments have taken place in the cities which in the nineties were simply referred to as the “Dirty Dozen”. Conversely, no substantial change can be observed in terms of the NOx and dust levels generated by transportation.