@idefix37 said in Question about PPBV:

@simonl
For Carbon monoxide (CO)
1 ppbv = 1.145 μg/m3
According to this source: https://www2.dmu.dk/AtmosphericEnvironment/Expost/database/docs/PPM_conversion.pdf
1 mg = 1000 μg
So when you say « And I found that 1 PPBV = 1 mg / m3 », you have mixed milligrams and micrograms.
173 ppbv =173 x 1.145 μg/m3 = 198 μg/m3 = 0.198 mg/m3
So it’s approximately 0.2 mg/m3... fortunately for you otherwise you would be dead !

Thank you!