Is lead biodegradable

Yes, in olden times, when cars used lead net in the smoke valve of the cars, at that time, it released a lot of smoke into the air. If one wanted to dispose it, he needed a lot of effort to do so. So, lead vapour is a non- biodegradable pollutant. Now a days too burning lead is poisonous thing and is a hateful thing to do to the workers. It releases CO2 in the air also.