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. Author manuscript; available in PMC: 2022 Sep 1.
Published in final edited form as: Am J Ind Med. 2021 Jun 10;64(9):758–770. doi: 10.1002/ajim.23265

Figure 2.

Figure 2.

o-Toluidine (OT) air concentrations during 1976–2005 by major departments in a chemical manufacturing plant, as log10(PPM): −1.2 ~ 0.06 ppm OT, −1.1 ~ 0.08 ppm OT, −0.8 ~ 0.16 ppm OT, −0.7 ~ 0.20 ppm OT (source: NIOSH14)