Every time someone fires their weapon, lead fragments and fumes are discharged at high pressure. Shooters then breathe in the metal, while other particles stick to their hands and are swallowed through smoking and eating.
..."While there is no safe level of lead exposure, US health bodies regard 5 micrograms per decilitre of blood as the level that's cause for concern.
"What this research found is that people using shooting ranges can record blood-lead levels as high as 40 micrograms, with women and children at particular risk.
..."The kind of blood-lead levels found among shooters can lead to essential tremor, hypertension, cardiovascular-related mortality, electrocardiography abnormalities, decreased kidney function, psychiatric effects, decreased hearing, decreased cognitive function, decreased fertility, incidence of amyotrophic lateral sclerosis, adverse sperm parameters, increased spontaneous abortion, and reduced fetal growth in children."
In the US, about one million law enforcement officers train at indoor firing ranges, 20 million citizens practice target shooting, and 16,000-18,000 indoor firing ranges exist.