What level of CO will hurt me or my family?
This is different for each person.
Since it is a poison, it affects everyone at different levels. Age, size, and health are other factors that can determine the effect CO has on them. You should contact your own physician for advice regarding this question.
Everyone is at risk from carbon monoxide poisoning, but some people are more vulnerable. Unborn babies, infants, children, seniors, and people with heart or lung problems are at higher risk from CO poisoning.