Chemistry Reference
In-Depth Information
a
PNC personal
PNC ambient
80000
Outdoor
In the office
Outdoor
70000
60000
50000
40000
30000
20000
10000
0
7:00
8:00
9:00
10:00
11:00
12:00
13:00
time
b
PNC personal
PNC ambient
80000
cafeteria with air conditions
turning on and out automatically
Outdoor
In the office
Outdoor
70000
60000
50000
40000
30000
20000
10000
0
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
time
Fig. 2 Two examples of time series of personal and ambient PNC: (a) participant spent mostly the
whole time indoors in an office and (b) participant spent time indoors in an office and a cafeteria
where
C
i
¼
gm
3
)
indoor concentration (
m
gm
3
)
C
a
¼
ambient (outdoor) concentration (
m
P
¼
penetration efficiency (dimensionless)
air exchange rate (h
1
)
a
¼
decay rate indoors (h
1
)
k
¼
gh
1
) (symbol used by Dockery and Spengler was
S
)
Q
¼
m
source strength (
