Category of Workers

Exposure Duration

in Years

Number of

Workers

Exposure

Category

Labour

0 - 5

30

1

5 - 10

27

2

10 - 15

36

3

>15

27

4

Dresser

0 - 5

32

1

5 - 10

27

2

10 - 15

36

3

>15

30

4

Driller

0 - 5

33

1

5 - 10

30

2

10 - 15

28

3

>15

34

4

Control workers

----------

36

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