Environment:

Normal

Contaminated Outside Dusty

Extremely Cold Weather Climates

High Humidity Biogenic

Day Care Center

2 weeks

1 week

2 weeks

1 week

Nursing Homes

1 month

1 month

1 month

1 week

Residence

(2 persons, non-smoking)

6-12 months

2 months

4-6 months

4-6 months

(2 persons with smoking)

4 months

2 months

3 months

4 months

(young children)

6 months

1 month

3 months

3 months

(young children and pets)

3-6 months

1 month

2 months

2 months

Office Building

(ground floor)

3-6 months

1-4 months

2-6 months

2-6 months

(higher floors)

6-12 months

2-6 months

3-9 months

3-9 months

Food Service

1 month

1 week

2 weeks

2 weeks

Establishments

Commercial

(retail shops, banks)

3-6 months

1 month

2 months

2 months