1 paroxysmal Pertaining to or marked by paroxysm; caused by paroxysms or convulsions of nature. 2  paroxysmal Specifically In geology: Relating to or produced by a violent convulsion of nature.
Inorganic lead compounds are Group 2A - Probably carcinogenic to humans. American Conference for Governmental Industrial Hygienists (ACGIH): A3 - Confirmed animal carcinogen. Teratogenicity / Embryotoxicity: DEVELOPMENTAL HAZARD. May harm the unborn child. Known to cause: learning disabilities, effects on behaviour.
Exposure to lead is dangerous because this heavy metal is a toxin which can cause severe health problems and death at high levels of exposure. Humans have been working with lead for centuries, and giving themselves lead poisoning at the same time due to a lack of understanding about the risks of lead exposure.