19085-1701857-UL_Prop_65_Test_Results_2019

Released by UL Environment
Date Prepared:
February 11, 2019
Report #:
1000339735-1162663EA
©2019 UL LLC
CA Prop 65 Exposure Assessment Page 8 | 15
0.23 h
-1
outdoor air change rate (CDPH 2017). For modeling the impacts of VOC emissions
from indoor building products, perfect mixing of indoor air throughout the home is assumed.
Emitting Surface Area of the Execumat Chair Mats
The emitting surface area for the Execumat Chair Mats is based on client-provided information.
The surface area of the Execumat Chair Mats is reported as 4.7 m
2
.
Table 1. Emitting surface areas and ventilation airflow rates
Exposure
Scenario
Emitting
Surface Area
(m
2
)
Ventilation
Airflow Rate
(m
3
/h)
Reference
Private Office 4.7 20.7
CDPH Standard
Method V1.2
School Classroom 4.7 191
CDPH Standard
Method V1.2
Home Residence
1
4.7 127
CDPH Standard
Method V1.2
1
Assumes air in home is perfectly mixed
INHALATION LIFETIME AVERAGE DAILY DOSES
In assessing NSRLs for carcinogens, the relevant period for exposure is not based on a single
daily exposure concentration, but rather on the average of the daily exposure concentrations
that occur over a consumer’s lifetime (Equation 2). A daily inhalation exposure concentration is
estimated by multiplying the indoor air concentration by the approximate volume of air that an
exposed consumer breathes during the exposure duration. This daily dose is then converted to
an LADD based on the number of days a year a consumer is exposed averaged over the
consumer’s expected lifetime. Therefore, a consumer’s LADD is calculated as follows:
LADD =
(

×)× ×
×
(Equation 2)
Where:
LADD = Lifetime average daily dose (µg/day)
C
a
= Estimated inhaled air concentration (µg/m
3
)
Br = Volume of air inhaled within the affected environment (m
3
/day)
EF = Exposure frequency (d/yr)
ED = Exposure duration (yr)
AT = Averaging time (yr)
CF = Conversion factor (365 d/yr)