Time-integrated air sampling for VOCs was collected in all 100 study buildings. The SUMMA canister method (method CAN) and aldehyde sample method (method ALD) were used in all 100 buildings, while the multisorbent method (method TNX) was used for the last 70 buildings studied. In addition, because the target VOC analyte list underwent some revision over the course of the BASE study, some analytes were sampled at fewer than the full 100 buildings.
- 100% Building Frequency of Detection Indoors
- 75% – 99% Building Frequency of Detection Indoors
- 1% – 74% Building Frequency of Detection Indoors
- Not Detected in BASE Study Buildings Indoors
Detected in 100% of Buildings Indoors
|
Analyte (Indoors) |
Number
of Buildings |
Building Frequency Detected Indoors (%)
|
Analyte Concentration Indoors Percentile (ug/m3)
|
Analyte Concentration Indoors Arithmetic Mean (ug/m3)
|
||
|---|---|---|---|---|---|---|
|
5th
|
50th
|
95th
|
||||
| Acetaldehyde |
86
|
100
|
2.6
|
7.2
|
15
|
7.8
|
| Acetone |
70
|
100
|
9.9
|
30
|
110
|
42
|
| Benzene |
70
|
100
|
1.1
|
3.6
|
9.1
|
4.2
|
| Nonanal |
41
|
100
|
1.5
|
3.6
|
7.9
|
4.3
|
| Toluene |
70
|
100
|
2.7
|
8.7
|
39
|
16
|
| 1,1,1-Trichloroethane |
70
|
100
|
0.97
|
3.1
|
21
|
11
|
| Chloromethane |
87
|
100
|
1.8
|
2.5
|
4.3
|
2.9
|
| Ethylbenzene |
70
|
100
|
0.43
|
1.5
|
6.2
|
2.4
|
| Formaldehyde |
100
|
100
|
4.4
|
15
|
32
|
16
|
| m- & p-Xylenes |
70
|
100
|
1.3
|
5.1
|
24
|
8.4
|
| n-Decane |
70
|
100
|
0.79
|
2.9
|
24
|
6.3
|
| n-Dodecane |
70
|
100
|
0.99
|
3.5
|
14
|
5.4
|
| n-Undecane |
70
|
100
|
0.96
|
4.0
|
19
|
6.3
|
| o-Xylene |
70
|
100
|
0.59
|
2.1
|
8.2
|
3.1
|
| 1,2,4-Trimethylbenzene |
70
|
100
|
0.61
|
1.9
|
12
|
3.3
|
| d-Limonene |
70
|
100
|
1.1
|
7.1
|
44
|
12
|
| Hexanal |
41
|
100
|
1.5
|
4.1
|
12
|
5.4
|
| Phenol |
41
|
100
|
0.38
|
1.8
|
7.3
|
2.5
|
| Ethyl Acetate |
70
|
100
|
0.34
|
2.0
|
7.5
|
3.7
|
| Tetrachloroethene |
70
|
100
|
0.3
|
1.5
|
18
|
3.8
|
| 2,2,4-Trimethyl-1, 3-PentanediolDiisobutyrate |
41
|
100
|
0.26
|
0.74
|
2.4
|
1.1
|
| 2-Ethyl-1-Hexanol |
41
|
100
|
0.26
|
1.2
|
5.1
|
1.8
|
| Nonane |
70
|
100
|
≤ LOQ
|
0.94
|
10
|
2.8
|
| Ethanol |
13
|
100
|
≤ LOQ
|
79
|
260
|
89
|
| 2-Propanol |
13
|
100
|
≤ LOQ
|
30
|
320
|
73
|
75% – 99% Building Frequency of Detection Indoors
| Analyte (Indoors) |
Number
of Buildings |
Building
Frequency Detected Indoors (%) |
Analyte Concentration Indoors
Percentile (ug/m3) |
Analyte Concentration Indoors
Arithmetic Mean (ug/m3) |
||
|---|---|---|---|---|---|---|
|
5th
|
50th
|
95th
|
||||
| 2-Butanone |
70
|
99
|
0.81
|
2.6
|
7.8
|
3.3
|
| Styrene |
70
|
99
|
0.091
|
0.91
|
3.0
|
1.3
|
| Octane |
70
|
99
|
≤ LOQ
|
0.85
|
6.4
|
3.3
|
| 2-Butoxyethanol |
41
|
98
|
0.036
|
5.5
|
68
|
12
|
| n-Hexane |
41
|
98
|
≤ LOQ
|
2.5
|
12
|
3.9
|
| Valeraldehyde (Pentanal) |
41
|
98
|
≤ LOQ
|
1.2
|
4.0
|
1.6
|
| Dichlorodifluoromethane |
87
|
97
|
≤ LOQ
|
6.8
|
36
|
33
|
| 4-Ethyltoluene |
70
|
96
|
≤ LOQ
|
0.77
|
4.1
|
1.3
|
| Butyl Acetate |
70
|
94
|
≤ LOQ
|
1.5
|
10
|
3.1
|
| a-Pinene |
70
|
94
|
≤ LOQ
|
0.57
|
3.1
|
0.94
|
| 2,2,4-Trimethyl-1, 3-Pentanediol monoisobutyratel |
41
|
93
|
≤ LOQ
|
2.5
|
19
|
5.4
|
| 1,3,5-Trimethylbenzene |
70
|
93
|
≤ LOQ
|
0.54
|
3.9
|
1.0
|
| 4-Methyl-2-Pentanone |
70
|
93
|
≤ LOQ
|
1.0
|
7.2
|
2.2
|
| 1-Butanol |
41
|
90
|
≤ LOQ
|
2.1
|
10
|
3.3
|
| Naphthalene |
70
|
90
|
≤ LOQ
|
0.73
|
2.6
|
0.95
|
| Methylene Chloride |
100
|
81
|
≤ LOQ
|
2.9
|
16
|
21
|
| 1,4-Dichlorobenzene |
70
|
77
|
≤ LOQ
|
0.54
|
13
|
2.8
|
| Trichlorofluoromethane |
100
|
73
|
≤ LOQ
|
3.9
|
51
|
19
|
1% – 74% Building Frequency of Detection Indoors
| nalyte (Indoors) |
Number
of Buildings |
Building
Frequency Detected Indoors (%) |
Analyte Concentration Indoors
Percentile (ug/m3) |
Analyte Concentration Indoors
Arithmetic Mean (ug/m3) |
||
|---|---|---|---|---|---|---|
|
5th
|
50th
|
95th
|
||||
| Carbon Disulfide |
87
|
67
|
≤ LOQ
|
≤ LOQ
|
6.4
|
2.0
|
| Trichloroethene |
70
|
66
|
≤ LOQ
|
0.29
|
2.6
|
0.76
|
| 3-Methyl Pentane |
70
|
64
|
≤ LOQ
|
1.4
|
6.6
|
2.3
|
| 2-Methyl-1-Propanol |
13
|
31
|
≤ LOQ
|
≤ LOQ
|
5.3
|
1.4
|
| Chloroform |
87
|
29
|
≤ LOQ
|
≤ LOQ
|
1.3
|
0.59
|
| t-Butyl Methyl Ether |
70
|
24
|
≤ LOQ
|
≤ LOQ
|
14
|
2.8
|
| n-Heptanal |
13
|
23
|
≤ LOQ
|
≤ LOQ
|
2.0
|
2.1
|
| Trichlorotrifluoroethane |
87
|
21
|
≤ LOQ
|
≤ LOQ
|
8.1
|
2.3
|
| Dimethyl Disulfide |
87
|
14
|
≤ LOQ
|
≤ LOQ
|
3.6
|
2.6
|
| Chlorobenzene |
70
|
13
|
≤ LOQ
|
≤ LOQ
|
0.26
|
0.18
|
| Carbon Tetrachloride |
70
|
8.6
|
≤ LOQ
|
≤ LOQ
|
0.74
|
0.93
|
| 4-Phenylcyclohexene |
41
|
7.3
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
0.17
|
| Bromomethane |
87
|
6.9
|
≤ LOQ
|
≤ LOQ
|
0.12
|
0.85
|
| 1,2-Dichloroethane |
87
|
4.6
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
1.1
|
| 1,2,4-Trichlorobenzene |
29
|
3.5
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
0.38
|
| Chloroethane |
87
|
3.5
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
1.4
|
| 1,2-Dichlorobenzene |
70
|
2.9
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
0.27
|
| Vinyl Chloride |
87
|
1.2
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
0.78
|
| 1,2-Dibromoethane |
87
|
1.2
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
1.1
|
Not Detected in BASE Study Buildings Indoors
| (Indoors) |
Number
of Buildings |
Building
Frequency Detected Indoors (%) |
Analyte Concentration Indoors
Percentile (ug/m3) |
Analyte Concentration Indoors
Arithmetic Mean (ug/m3) |
||
|---|---|---|---|---|---|---|
|
5th
|
50th
|
95th
|
||||
| 1,1-Dichloroethane |
46
|
–
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
–
|
| 1,1-Dichloroethene |
46
|
–
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
–
|
| 1,3-Butadiene |
13
|
–
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
–
|
| Butylated Hydroxytoluene |
41
|
–
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
–
|
| cis-1,3-Dicholorpropene |
46
|
–
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
–
|
| Dichlorotetrafluoroethane |
46
|
–
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
–
|
| trans-1,3-Dichloropropene |
46
|
–
|
≤ LOQ
|
≤ LOQ
|
≤ LOQ
|
–
|
