Question about PPBV
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Hello,
Sorry if this is the wrong place but I want to understand something :
Windy says "CO concentration: Carbon monoxide is a colorless, odorless, and tasteless gas that is slightly less dense than air. The level of CO concentration in the troposphere is measured by a system called Parts Per Billion by Volume (PPBV)."
I've found some different thresholds on the web in microgram per cubic meters
I wanted to check, in my city how much we were about some dangerous thresholds.
My city was at 173 PPBV but I had some troubles converting these 173 PPBV in mg / m3
And I found that 1 PPBV = 1 mg / m3
So that means 173 PPBV = 173 mg / m3
But thresholds say :
10 mg·m-3, for 8 h
30 mg·m-3, for 1 h
60 mg·m-3, for 30 min
100 mg·m-3, for 15 minSo 173 PPBV = 173 mg / m3 is much above the thresholds. Something is wrong with my result. Anyone could help about that? I may have missed something...
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@simonl
For Carbon monoxide (CO)
1 ppbv = 1.145 μg/m3According 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 !
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@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!
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@simonl
@idefix37
Good afternoon! I am trying to understand what PPBV means when applied to the norms in my country. We have:
rural areas - 332 ppm
small towns - 409 ppm
Big cities - 511 ppm.
now in my city 500 ppbv, if you believe the map is a serious excess, вut how to convert PPBV to ppm?
But when converted to ppm, it turns out that it is 0.5 ppm. Where is the error? Please help me to understand -
ppm means part per million
ppb means part per billion (and ppbv is just specifying by volume)
1 ppm = 1000 ppb
0.5 ppm = 500 ppb
Generally for gases ppm is expressed in volume and your standards are probably in ppm by volume. But you must check it.
