… / fotolia.com Nickel belongs to the heavy metals and usually occurs bound to other substances. In ambient air arsenic is measured bound to particulate matter. last … heavy metal … Nickel belongs to the heavy metals and usually occurs bound to other substances. In ambient air arsenic is measured bound to particulate matter. … Nickel …

… and cancerogenic. It belongs to the heavy metals and usually occurs bound to other substances. In ambient air arsenic is measured bound to particulate matter. last … and cancerogenic. It belongs to the heavy metals and usually occurs bound to other substances. In ambient air arsenic is measured bound to particulate matter. … …

… 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 … particulate matter … Lead is a toxic heavy metal and usually occurs bound to other substances. In ambient air lead is measured bound to particulate matter. … Until the …

… characteristics. It rarely occurs elementary but most of the time bound to other substances. In ambient air arsenic is measured bound to particulate matter. last … characteristics. It rarely occurs elementary but most of the time bound to other substances. In ambient air arsenic is measured bound to particulate matter. … …