carbon monoxide--FD is here what does this mean?

carbon monoxide detector 9 ppm image

JMITW

22 parts per million carbon monoxide?
the FD is at by building--they say there are 22 parts per million CO in the basement--is that normal?

someones detector went off

know they are saying 30--but aren't evacuating--only 1 apartment affected so far
it doesn'gt necessarily have to be a heater-

i wanst to know teh significance of teh amount of CO
like is 30 still considered a low reading--or a very high reading
the issue wasn't resolvedin teh basement--if was left overnight until maintenace could address it the next day--
the area will the 1000 reading was left alone over night
i found out after wardsa about the basement with the 1000 reading

Answer
In my area the natural gas company treats it as an emergency and responds right away with any reading 9 ppm or higher.

I would not let my family stay in any area with any CO reading.

The Center for Disease Control site has info on CO.

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