https://www.sciencedaily.com/release...1104005801.htm
Lead in the form of petrol lead or chemical lead in industrial practices is worse.Once the lead has oxidised, the oxidisation stops further deterioration. Remember most house holds have lead gullies in their roofing, most houses had lead pipe work. You have to watch out for some reports on lead contamination especially if such organisations are trying to ban something ie stop an activity, as they can be misleading in the sense that they may exaggerate the contamination onto shooting etc when the area in question was already polluted by other forms of lead.