A plenty of studies assess the increase in metals around in environment. Many places and many metals are concerned all over the world. In fact, every place where there is a car traffic is concerned.
The main source is obviously the catalytic converters. As a catalyst platinum is not supposed to leave the converter but during the lifetime of the converter a certain amount is released and is dispersed in environment.
MENTIONNER LAIDE APPORTEE PART M.TRIBOIT