Where It Comes From
Made as an intermediate for dye and rubber production; also used in research. Can be found at older industrial sites and in waste streams from these processes [1][2].
How You Are Exposed
Mostly at work—breathing contaminated air, skin contact with powders or solutions, or touching contaminated surfaces. Community exposure is uncommon but can occur near facilities or spills [2].
Why It Matters
Can cause headaches, dizziness, nausea, and blue-tinged skin from methemoglobinemia; may damage liver and blood. Classified by IARC as possibly carcinogenic to humans (Group 2B) [1][2].
Who Is at Risk
Workers in dye, rubber, and specialty chemical production; maintenance and cleanup crews; laboratory staff; people living near poorly controlled facilities [2].
How to Lower Your Exposure
Use closed systems, local exhaust, and chemical-resistant gloves and clothing; avoid skin contact; wash up after work; follow NIOSH/OSHA controls. Near sites, test private wells and follow local advisories [2].
References
- [1]International Agency for Research on Cancer (IARC). IARC Monographs: 4-Nitrobiphenyl (Group 2B).
- [2]CDC/NIOSH. Pocket Guide to Chemical Hazards: p-Nitrobiphenyl (CAS 92-93-3).