Other Guidelines
NRC (1987) EEGLs: 10 min = 1,500 ppm 30 min = 800 ppm 60 min = 400 ppm 24 hrs = 50 ppm
NRC = National Research Council
EEGL is Emergency Exposure Guidance Levels
Canadian IAQ Residential Exposure Guidelines: ppm for 8 hrs, ញ ppm for 1hr (ASTER)
WHO Concentration of Concern is ᡖ ppm