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Table 4 Lead concentrations compared with international standards

From: Environmental assessment of pediatric Lead exposure in Tehran; a prospective cross-sectional study

Lead level

Median (IQR)

Standard limit

p-value

Scratched paint (ppm)

105.6 (71.1–123.7)

90 (CPSCa)

0.28

House floor dust (μg/ft2)

77.4 (66.5–84)

10 (EPAb)

< 0.001

Interior window-sills dust (μg/ft2)

291 (231.2–345.2)

100 (EPAb)

< 0.001

Tap water (μg/kg)

63.5 (36–78.9)

15 (EPAb)

< 0.001

Spice (μg/kg)

56.7 (20.6–98.5)

300 (WHOc)

< 0.001

  1. a Consumer product safety commission
  2. b Environmental protection agency
  3. c World health organization