The worst would be a small leak of CO (not CO2) , even in very small quantities, daily miligrams of CO coming from a leaky(small leak) Gas burning heating system. This will most probably get students scores down, among other extremmely bad health effects.
Bigger CO leaks are extremely dangerous, many people lost their lives because of heating systems.
If you can, change to Oil Flow system with burner outside the house and far and aislated from humans. Or, if you can, electrical system. CO from gas is Really Very dangerous.
(using the word "very" is against Mark Twain's advice[1], and using the word "really" is against my own advice, but there are exceptions, here above was one)
1:
“Substitute "damn" every time you're inclined to write "very" ; your editor will delete it and the writing will be just as it should be.”
Mark Twain
2- "delete all instances of "really" in you text, and your writing will be better"
ImmerseintheImmensity, Also unknown as InfimousInfinity, Also unknown as ParadoxParalax
Bigger CO leaks are extremely dangerous, many people lost their lives because of heating systems.
If you can, change to Oil Flow system with burner outside the house and far and aislated from humans. Or, if you can, electrical system. CO from gas is Really Very dangerous.
(using the word "very" is against Mark Twain's advice[1], and using the word "really" is against my own advice, but there are exceptions, here above was one)
1:
“Substitute "damn" every time you're inclined to write "very" ; your editor will delete it and the writing will be just as it should be.”
2- "delete all instances of "really" in you text, and your writing will be better"ImmerseintheImmensity, Also unknown as InfimousInfinity, Also unknown as ParadoxParalax