"The World Health Organization has classified toner waste as class 2B carcinogen due to its potential health hazard."
Reference:
Parthasarathy, Meera. “Challenges and Emerging Trends in Toner Waste Recycling: A Review.” Recycling, vol. 6, no. 3, 29 Aug. 2021, p. 57, https://doi.org/10.3390/recycling6030057.