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I need help converting 90 ug/m^3 to ppm

77 viewed last edited 2 years ago
Shubhanan Kulkarni
0

I know there is some dimensional analysis involved, but I am just not sure where to start or how to do it in this particular conversion?

edit: here is the actual question: Did any of the measurements exceed the National Ambient Air Quality Standard for ozone for 1-hour exposure?  For 8 hour exposure?

Here is what I have as my answer so far: According to the EPA website, the standard for 1-hour exposure of ozone is 0.12 ppm, and the standard for 8-hour exposure is 0.070 ppm.


here is the data table needed for the conversions:


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Mahesh Godavarti
2

Take a look at the following link for converting g/m^3 to ppm.


https://www.lenntech.com/calculators/ppm/converter-parts-per-million.htm


To be able to use this, we need the molecular weight of ozone. Googling for molecular weight of ozone, we get 48g/mol (simply search for "molecular weight of ozone").


Let's calculate what 1ppm of ozone is in mg/m^3 . Using the formula on the site


Where:

Vm =standard molar volume of ideal gas (at 1 bar and 273.15 K) = 22.71108 L/mol


M = molecular weight of ozone = 48 g/mol


Note that the site has a typo. It should actually be 1ppm = \frac{M}{V_m} \frac{1 \mu g \ gas }{1 L \ air} .


Therefore, 1ppm = 48/22.711 \mu g / L = 2.11 \mu g / L = 2.11 mg/m^3 .


Note that 1m^3 = 1000L. Therefore, \mu g / L = mg /m^3 .


Therefore, 0.12 ppm = 2.11 \times 0.12 mg / m^3 = 0.24 mg/m^3 .

Shubhanan Kulkarni
1
wow! thank you! I appreciate you taking the time to answer my question! It significantly helped!
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Air quality index - Wikipedia


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ppm: parts-per million


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Ozone Conversions & Equations | OzoneSolutions.com


Jan 19, 2015 ... Density of ozone: 2.14 kg/m3; Molecular weight of ozone: 48; Density of oxygen: 1.43 kg/m3; Molecular weight of oxygen: 32 ... Useful Conversion Factors: (for water) ... 1 mg/l = 1 PPM O3 = 1 g O3/m3 water {By weight} ...


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