Table 5 The recommended daily exposure values of five age groups for estimating daily exposure dose via dust ingestion and dermal absorption

Dust ingestion

Weight (kg)^a

9.4

16.3

28.8

54.8

63.5

Daily ingestion rate (g/day)^a

0.06

0.10

0.103

0.086

0.05

Indoor exposure fraction^b

0.875

0.792

0.792

0.875

0.875

Dermal absorption

Weight (kg)^a

9.4

16.3

28.8

54.8

63.5

Total skin area (cm²)^a

4475

6940

11,500

16,100

17,000

Body surface area (cm²/day)^b

1119

1735

2875

4025

4250

Dust adhered to skin (mg/cm²)^b

0.096

0.096

0.096

0.096

0.096

NBFR fraction absorbed through the skin^a

0.03

0.03

0.03

0.03

0.03

Indoor exposure fraction^b

0.875

0.792

0.792

0.875

0.875