In the air, no more than 50 micrograms per cubic meter of air averaged over an 8-hour period (As stated in 29 CFR 1926) The “action level” for employees working with lead exposure without regard to the use of respirators, to an airborne concentration of lead of 30 micrograms per cubic meter of air calculated as an 8-hour time-weighted average. In your blood; no more than 40 milligrams per deciliter. The most common way to measure the amount of lead in blood is the BLL (Blood Lead Level) test.
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