A 2C dilution (100 ppm) of hydrogen sulfide diffused in water is sufficient to cause throat irritation and conjunctivitis.
Obviously, diluting it further doesn't make it stronger.
On the other hand, a concentration just 3 to 5 times stronger can be dangerous. And ten times stronger (1000 ppm) can render a normal human name unconscious within minutes and dead within an hour.
Depends on the level of dilution.
A 2C dilution (100 ppm) of hydrogen sulfide diffused in water is sufficient to cause throat irritation and conjunctivitis.
Obviously, diluting it further doesn't make it stronger.
On the other hand, a concentration just 3 to 5 times stronger can be dangerous. And ten times stronger (1000 ppm) can render a normal human name unconscious within minutes and dead within an hour.
(source: night job)