Concentration (ppm)

 Effects and Toxicity

0.025

 Smell vaguely. (It varies according to the individual.)

0.3

 Smell clearly.

3～5

 Smell moderate degree of objectionable odor.

10

 Lower-level to irritate eyes' mucus membranes. 

20～40

 A strong odor. Lower-level to irritate lungs' mucous membranes.

100

 Sense of smell is impaired in 2 ~ 15 minutes. Eyes and respiratory tract are  irritated in 1 hour.  8 ~ 48 hours continuous exposure can lead to death.

170～300

 1 hour exposure is the limit for not causing serious health problems.

400～700

 Life-threatening exposure in 0.5 ~ 1 hour.

800～900

 Bring on loss of consciousness, cessation of breathing and death.

1000

 Bring on immediate loss of consciousness and death.