Michael A Berry Ph.D.

Deputy Director , Environmental Criteria and Assessment Office

Environment:

Normal

Dusty

Climates

Biogenic

Day Care Center

2 wk.

1 wk.

2 wks.

1 wk.

Nursing Homes

1 mo.

1 mo.

1 mo.

1 wk.

Residence

(2 persons, Non-smoking)

6-12 mos.

2 mos.

4-6 mos.

4-6 mos.

(2 persons,with smoking)

4 mo.

2 mos.

3 mos.

4 mos.

(young children)

6 mo.

1 mo.

3 mos.

3 mos.

(young children with pets)

3-6 mos.

1 mo.

2 mos.

2 mos.

Office Building:

(ground floor)

3-6 mos.

1-4 mos.

2-6 mos.

2-6 mos.

(higher floors)

3-12 mos.

2-6 mos.

3-9 mos.

3-9 mos.

Food Service Establishments

1 mo.

1 wk

2 wks

2 wks

Commercial:

(retail shops, banks)

3-6 mos.

1 mo.

2 mos

2 mos

(from: US EPA Letter, January 1989)