The employer shall ensure that workers’ exposure to hazards at job sites is below the permissible limits specified in Attachment 1 or Attachment 2. If a hazardous substance not listed with a permissible exposure limit in Attachment 1 is detected, it shall be deemed to exceed the Standard.Appendix 1 Permissible Exposure Limits of Hazardous Substances in Air.pdfAppendix 2 Permissible Exposure Limits of Dusts in Air.pdf