Asphalt Table A-3

http://ntp.niehs.nih.gov/go/17342

Table A-3. Exposure concentrations measured during hot-mix asphalt preparation

				Exposure concentration (mg/m3)
		Sample			Mean
Occupation	Source of Exposure	Number	Type	Range	Arithmetic	Geometric	Reference
Not specified	Preparation of HMA	8	Total particulates	0.5-7.2	___	___	Puzinauskas & Corbett (1975)
		8^†	Benzene solubles	0.2-5.4	___	___

Man in control cabin and operator on HMA storage bins	Asphalt plants (2)	___	Total particulates 8-hr TWA	BLD-1.7	0.7	___	Byrd & Mikkelsen (1979)

Loader/Operator	HMA preparation (temperature of product at fume source ranged from 129-170 C)	9	Total particulates 6-hr TWA	0.16-6.0	1.8	1.2	AI (1991)
		9	Benzene solubles 6-hr TWA	0.033-1.7	0.33	0.16

Groundman		9	Total particulates 6-hr TWA	0.17-1.4	0.61	0.53
		9	Benzene solubles 6-hr TWA	0.062-0.43	0.23	0.19

Plant operator		6	Total particulates 6-hr TWA	0.1-1.5	0.79	0.58
		6	Benzene solubles 6-hr TWA	0.026-0.28	0.16	0.13

Laborer		5	Total particulates 6-hr TWA	0.2-15	4.0	1.5
		5	Benzene solubles 6-hr TWA	0.011-0.22	0.1	0.069

Foreman/ Supervisor		4	Total particulates 6-hr TWA	0.27-1.1	0.61	0.53
		4	Benzene solubles 6-hr TWA	<0.065-1.4	0.5	0.28

^* Concentrations are reported as milligrams of asphalt fumes per cubic meter of air (mg/m³) in personal samples, except for those figures marked with an (†) which were area samples.

Web page last updated on August 15, 2005