if co2 is not hazards what would be the % in the atmosphere we breath for it to do us harm?
and what form would that harm be?

robadob said:

if co2 is not hazards what would be the % in the atmosphere we breath for it to do us harm?
and what form would that harm be?

deadly.

What are the main health hazards associated with breathing in carbon dioxide gas?

Carbon dioxide (CO2) is naturally present in the atmosphere at levels of approximately 0.035%. Short-term exposure to CO2 at levels below 2% (20,000 parts per million or ppm) has not been reported to cause harmful effects. Higher concentrations can affect respiratory function and cause excitation followed by depression of the central nervous system. High concentrations of CO2 can displace oxygen in the air, resulting in lower oxygen concentrations for breathing. Therefore, effects of oxygen deficiency may be combined with effects of CO2 toxicity.

Volunteers exposed to 3.3% or 5.4% CO2 for 15 minutes experienced increased depth of breathing. At 7.5%, a feeling of an inability to breathe (dyspnea), increased pulse rate, headache, dizziness, sweating, restlessness, disorientation, and visual distortion developed. Twenty-minute exposures to 6.5 or 7.5% decreased mental performance. Irritability and discomfort were reported with exposure to 6.5% for approximately 70 minutes. Exposure to 6% for several minutes, or 30% for 20-30 seconds, has affected the heart, as evidenced by altered electrocardiograms.

Workers briefly exposed to very high concentrations showed damage to the retina, sensitivity to light (photophobia), abnormal eye movements, constriction of visual fields, and enlargement of blind spots. Exposure to up to 3.0% for over 15 hours, for six days, resulted in decreased night vision and colour sensitivity.

Exposure to 10% for 1.5 minutes has caused eye flickering, excitation and increased muscle activity and twitching. Concentrations greater than 10% have caused difficulty in breathing, impaired hearing, nausea, vomiting, a strangling sensation, sweating, stupor within several minutes and loss of consciousness within 15 minutes. Exposure to 30% has quickly resulted in unconsciousness and convulsions. Several deaths have been attributed to exposure to concentrations greater than 20%. Effects of CO2 can become more pronounced upon physical exertion, such as heavy work.

http://www.ccohs.ca/oshanswers/chemicals/chem_profiles/carbon_dioxide/health_cd.html

Effects of CO2 can become more pronounced upon physical exertion

ie: stop work when above conditions become apparent.

for your future reference

% co2 hazardous to health

is what i asked google.

i worded it slightly different and was getting no were.

thanks

The WIKI page has some good information.

http://en.wikipedia.org/wiki/Carbon_dioxide#Toxicity

Carmen_Sandiego said:

The WIKI page has some good information.

http://en.wikipedia.org/wiki/Carbon_dioxide#Toxicity

Yes it does but we have no excuses for pushing the risk limitations.

were at .035% but it seems not to be an issue till it gets over 1%

robadob said:

were at .035% but it seems not to be an issue till it gets over 1%

it is an issue if that is what you are breathing.

robadob said:

were at .035% but it seems not to be an issue till it gets over 1%

Would be good for plants, but not for us.

(discounting any effects of increased global temperature)

the point im looking at is it is not spontaneously fatal at that leave

robadob said:

the point im looking at is it is not spontaneously fatal at that leave

that’s when you turn the fans on.

nothing to do with fans

robadob said:

nothing to do with fans

you know nothing about air currents.

wake and have a coffee.

my interest in this question has nothing to do with the environment.
just at what levels a human can operate in a rich CO2 environment with out dieing straight away

my interest in this question has nothing to do with the environment.
just at what levels a human can operate in a rich CO2 environment with out dieing straight away

c’mon, own up. you’re going to mars aren’t you?

robadob said:

wake and have a coffee.

my interest in this question has nothing to do with the environment.
just at what levels a human can operate in a rich CO2 environment with out dieing straight away

As the CO2 level in the blood increases so the breathing rate increases so if you are thinking about voluntary euthanasia, this is not a good way to go.

no.
was wondering if you needed to send people in to an area of high CO2 to perform a task that would have some benefit. how high could it be before those sent in would no longer be able to function.
not interested in long term effects.

would use his little brother CO for that job :)bob(from black rock) said:

robadob said:

wake and have a coffee.

my interest in this question has nothing to do with the environment.
just at what levels a human can operate in a rich CO2 environment with out dieing straight away

As the CO2 level in the blood increases so the breathing rate increases so if you are thinking about voluntary euthanasia, this is not a good way to go.

:)
no but if i was sending some one i need to know how long they could function if conditions weren’t perfect Boris said:

my interest in this question has nothing to do with the environment.
just at what levels a human can operate in a rich CO2 environment with out dieing straight away

c’mon, own up. you’re going to mars aren’t you?

Mitt has Binders full of Electoral Pins :)

oops

:)

robadob said:

no.
was wondering if you needed to send people in to an area of high CO2 to perform a task that would have some benefit. how high could it be before those sent in would no longer be able to function.
not interested in long term effects.

Give ‘em SCBA.

no.. was just a thought.
give them SCBA. That cost money :).Angus Prune said:

robadob said:

no.
was wondering if you needed to send people in to an area of high CO2 to perform a task that would have some benefit. how high could it be before those sent in would no longer be able to function.
not interested in long term effects.

Give ‘em SCBA.

robadob said:

no.
was wondering if you needed to send people in to an area of high CO2 to perform a task that would have some benefit. how high could it be before those sent in would no longer be able to function.
not interested in long term effects.

there are none.. do not send them in without oxygen.