National Fire Protection Association; Fire Protection Guide to Hazardous Materials. 14TH Edition, Quincy, MA 2010. 49-144.
Vapors of toluene cause noticeable sensation of irritation to human eyes at 300-400 ppm in air ... .
Grant, W.M. Toxicology of the Eye. 3rd ed. Springfield, IL: Charles C. Thomas Publisher, 1986. 927.
Acute effects in humans following exposure to toluene: ... 200 ppm: mild throat and eye irritation; ... 400 ppm: lacrimation and irritation to the eyes and throat ... . /From table/
Eye and upper airway irritation occurred after a 6.5 hr exposure to an air level of 100 ppm (377 mg/cu m) toluene, and lachrymation was seen at 500 mg/cu m.
IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work). Available at: http://monographs.iarc.fr/ENG/Classification/index.php. V47 101 (1989).