| Agent Name | SULFUR TRIOXIDE |
| CAS # | 7446-11-9 |
| RTECS # | WT4830000 |
| Agent Code | M0745 |
| Code | Occupation Description (1980) | Total # Employees (Male & Female) |
Total # Female Employees |
| 053 | CIVIL ENGINEERS | 468 | |
| 216 | ENGINEERING TECHNICIANS, N.E.C. | 718 | 120 |
| 224 | CHEMICAL TECHNICIANS | 457 | 91 |
| 235 | TECHNICIANS, N.E.C. | 512 | 183 |
| 453 | JANITORS AND CLEANERS | 329 | |
| 547 | SPECIFIED MECHANICS AND REPAIRERS, N.E.C. | 154 | |
| 558 | SUPERVISORS, N.E.C. | 3,126 | |
| 563 | BRICKMASONS AND STONEMASONS | 5,450 | |
| 565 | TILE SETTERS, HARD AND SOFT | 2,217 | |
| 567 | CARPENTERS | 346 | |
| 575 | ELECTRICIANS | 69 | |
| 584 | PLASTERERS | 184 | |
| 585 | PLUMBERS, PIPEFITTERS, AND STEAMFITTERS | 4,329 | 69 |
| 588 | CONCRETE AND TERRAZZO FINISHERS | 1,246 | |
| 595 | ROOFERS | 5,584 | |
| 633 | SUPERVISORS, PRODUCTION OCCUPATIONS | 288 | |
| 647 | PRECIOUS STONES AND METALS WORKERS (JEWELERS) | 677 | 483 |
| 709 | GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS | 1,602 | 925 |
| 756 | MIXING AND BLENDING MACHINE OPERATORS | 660 | |
| 777 | MISCELLANEOUS MACHINE OPERATORS, N.E.C. | 3,161 | 347 |
| 779 | MACHINE OPERATORS, NOT SPECIFIED | 1,021 | 17 |
| 804 | TRUCK DRIVERS, HEAVY | 5,168 | |
| 844 | OPERATING ENGINEERS | 2,422 | 181 |
| 856 | INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS | 906 | 115 |
| 869 | CONSTRUCTION LABORERS | 14,745 | 453 |
| 887 | VEHICLE WASHERS AND EQUIPMENT CLEANERS | 97 | |
| 889 | LABORERS, EXCEPT CONSTRUCTION | 165 | 91 |
| TOTAL | 56,102 | 3,077 | |
*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.