The following chart from: U.S. EPA, January, 1989
|
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, nonsmoking |
6-12 months |
2 months |
4-6 months |
4-6 months |
|
2 persons, w/ smoking |
4 months |
2 months |
3 months |
4 months |
|
young children |
6 months |
1 month |
3 months |
3 months |
|
young children w/ 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 Establishments |
1 month |
1 week |
2 weeks |
2 weeks |
|
Commercial
(retail shops, banks) |
3-6 months |
1 month |
2 months |
2 months |
|