100-150 parts per million (ppm) - Loss of smell (olfactory fatigue or paralysis)
200-300 ppm - Marked conjunctivitis and respiratory tract irritation after 1 hour. Pulmonary edema may occur from prolonged exposure
500-700 ppm - Staggering, collapse in 5 minutes. Serious damage to the eyes in 30 minutes. Death after 30-60 minutes
700-1000 ppm - Rapid unconsciousness, "knockdown" or immediate collapse within 1 to 2 breaths, breathing stops, death within minutes.
1000-2000 ppm - Nearly instant death
the saga of the city's sanctioning of poison in our homes and the ensuing “dog and pony show.” --
coming soon to this blog
