^{ug/ft2 - micrograms per square foot (dust sampling})

ppm - parts per million (paint, soil, and waste)*
ug/g - microgram per gram (paint, soil, and waste)*
mg/kg - milligram per kilogram (paint, soil, and waste)*

** = ppm. ug/g, and mg/kg are equivalent and may be used interchangeably

% - percent by weight (paint)

1% = 10,000 ppm

^{mg/cm2 - milligrams per square centimeter (paint)}

area measurement, so used by XRF or measured paint chip

ug/dL - micrograms per deciliter (blood

^{ug/m3 - micrograms per cubic meter (air)}

Paint:
1.0 mg/cm2
5000 ppm (or ug/g or mg/kg)
0.5%

New Paint:
600 ppm
0.06%

Dust:
Floors
Window Sills
Window Troughs
 

40 ug/ft2
250 ug/ft2
400 ug/ft2 (clearance only)

Soil:
Play Area (level of concern)
Other

400 ppm (or ug/g or mg/kg)
1200 ppm (or ug/g or mg/kg)

Airborne lead particulate (OSHA):
Action Level
Permissible Exposure Limit (PEL)

30 ug/m3
50 ug/m3

Blood Lead Levels:
CDC Level of Concern
OSHA Allowable Blood Lead Level
OSHA Medical Removal Level

10 ug/dL (for children)
40 ug/dL
50 ug/dL

Hazardous Waste:
TCLP (Toxicity Characteristic Leaching Procedure) - 5 ppm

Lead in Drinking Water: - 15 ppb