WAC 173-476-120. Ambient air quality standard for lead (Pb)

(1) Standard for lead. The three-month rolling average concentration of lead and its compounds in the ambient air must not exceed 0.15 μ g/m 3 . (2) Measurement method. The levels of lead in the ambient air must be measured by: (a) A FRM based on 40 C.F.R. Part 50, Appendix G and designated according to 40 C.F.R. Part 53; or (b) A FEM designated according to 40 C.F.R. Part 53. (3) Interpretation method. The interpretation method found in 40 C.F.R. Part 50, Appendix R must be used.