Study population and available benzene exposure data by type of industry
| Industry | Study subjects (n) | Factories/facilities (n) | ||
|---|---|---|---|---|
| Total | With estimated benzene exposure levels | Estimated benzene exposure level ⩾25 ppm* | ||
| *In 1966/67. | ||||
| †nec, not elsewhere classified. | ||||
| ‡Principally light engineering, electrical manufacturing, and electronics. | ||||
| Coking plants, tar refineries, gas production | 700 | 38 | 25 | 9 |
| Manufacture of chemicals and dyes (nec)† | 1692 | 53 | 29 | 6 |
| Manufacture of boots, shoes, and leather goods | 53 | 12 | 11 | 10 |
| Printers and photographic studios | 480 | 26 | 9 | 2 |
| Manufacture of paint, varnish, lacquers, and polish | 464 | 15 | 11 | 7 |
| Manufacture of rubber | 658 | 23 | 12 | 6 |
| Production of carbon black | 23 | 1 | 0 | – |
| Iron and steel foundries, smelters | 123 | 6 | 4 | 0 |
| Oil refineries and petroleum distribution | 339 | 7 | 5 | 2 |
| Electricity generation and transmission | 29 | 6 | 1 | 1 |
| Manufacture of linoleum | 68 | 1 | 1 | 1 |
| Other industries‡ | 872 | 41 | 20 | 10 |
| Not classified | 13 | 4 | 2 | 1 |
| Total | 5514 | 233 | 130 | 55 |