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. 2020 Sep 18;36(11):885–891. doi: 10.1177/0748233720947203

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (https://creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — TWA-8 distributions, and indications of incidence of asthma cases “consistent with being induced by TDI” and non-use of respiratory protective equipment. The 2–3 ppb values were selected as potential breaks between “normal” background and task-related samples to the left and samples that are indicative of exceptional situations to the right. In a low-background environment, TWA-8 values of 2–3 ppb signal approaching STEL-allowances in force at the time of the study. TDI: toluene diisocyanate; STEL: short-term exposure limit; TWA: time-weighted average.