Having dealt with lead in various forms, fume, ingot and powder in industrial settings I can assure that airborne lead is a siginificant inhalation hazard.
high blood lead levels should be dealt with by a qualified Industrial Health Professional.
A properly designed indoor range should have a ventilation system which sweeps the air from behind the shooters, toward the target, and exit the range above and behind the bullet trap.
For those of you who are intrested in building an indoor range you should consult an Industrial Hygienist. The ACIGH has a design standard for Indoor firing ranges.
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