Vinyl Chloride - Texas Commission on Environmental Quality

<strong>Vinyl</strong> chloride
Page 4
Chapter 1 Summary Tables
Table 1 provides a summary of health- and welfare-based values from an acute and chronic evaluation of
vinyl chloride (VC). Table 2 provides summary information on VC’s chemical and physical properties.
Table 1. Health- and Welfare-Based Values
Short-Term Values Concentrations
20,000 µg/m
Notes
acute
ESL [1 h]
(HQ = 0.3)
3
(7800 ppb)
Short-term ESL for Air
Permit Reviews
acute ReV
68,000 µg/m
(HQ = 1.0)
3
(26,000 ppb) a
Critical effect: mild headache and
dryness of eyes and nose in humans
acute
ESLodor
[1 h]
---
Data are inadequate. See section 3.2.1
for information
acute ESLveg --- No data found
Long-Term Values Concentrations Notes
chronic
ESLnonlinear(nc)
(HQ = 0.3)
18 µg/m 3 chronic ReV
(6.9 ppb)
(HQ = 1.0)
60 µg/m 3 (23 ppb) a
Critical effect: increase in incidence
of centrilobular hypertrophy in liver of
female rats
chronic ESLlinear(c)
1.2 µg/m 3 a, b, c
(0.45 ppb)
Long-term ESL for Air
Permit Reviews
Cancer Endpoint: increase in
incidence of liver angiosarcoma
chronic
ESLveg --- No data found
a
Values that may be used for evaluation of air monitoring data
b -6 3 -5
Unit risk factor (URF) = 8.4 x 10 per µg/m (2.2 x 10 per ppb)
c 3
Value is protective of early-life exposure. If children are not expected to be exposed, the higher value of 2.3 µg/m
(0.90 ppb) may be used
Abbreviations: ppb, parts per billion; μg/m 3 , micrograms per cubic meter; h, hour; ESL, Effects
Screening Level; ReV, Reference Value; acute ESLodor, acute odor-based ESL; acute ESLveg, acute
vegetation-based ESL; chronic ESLnonlinear(nc), chronic health-based ESL for nonlinear dose-response
noncancer effects; chronic ESLlinear(c), chronic health-based ESL for linear dose-response cancer effects;
chronic ESLnonlinear(c), chronic health-based ESL for nonlinear dose-response cancer effects; chronic ESLveg,
chronic vegetation-based ESL; and HQ, hazard quotient