Article from 30.08.2023 | Last changed: 30.08.2023
… Source: B. Plank / Fotolia.com Lead is a toxic heavy metal and usually occurs bound to other substances. In ambient air lead is measured bound to particulate matter. last update on 30.08.2023 Emission sources Until the … beginning of the 1990s road traffic used to be the main emission source. Lead compounds were used as anti-knock additives in petrol. Car exhausts lead to an immense …