11. Airborne occupational exposure limits for asbestos are based on using the PCM method. 12. The federal limit for occupational exposure is 40 micrograms per deciliter. 13. Occupational exposure studies indicate that it has to be quick,14. Analysis of occupational exposure to asbestos based on threshold regression modeling of case-control data. 15. Government agencies in the United States have set occupational exposure limits for PCl 3. 16. The agency has issued non-binding, alternate occupational exposure limits that may better protect workers. 17. Non-occupational exposure to isothiazolinones by the general population also occurs, albeit at much lower concentrations. 18. Today's occupational exposure limit is 5 roentgens per year. 19. Airline crews receive occupational exposures from cosmic radiation because of reduced atmospheric shielding at altitude. 20. Occupational exposure limits may be one of two types : rate limited or dose limited.
