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Common Conversions page title

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Converting Atmospheric Pollutant Concentrations:

from mg/m3 to ppmv

The conversion factor depends on the temperature at which you want the conversion (usually about 20 to 25 degrees Centigrade). At an ambient pressure of 1 atmosphere, the general equation is:

ppmv = (mg/m3)(273.15 + °C) / (12.187)(MW)

where :

ppmv: ppm by volume
mg/ m3: milligrams of gaseous pollutant per cubic meter of ambient air
MW: molecular weight of the gaseous pollutant
° C: ambient air temperature in degrees Centigrade

from ppmv to mg/m3

The conversion factor depends on the temperature at which you want the conversion (usually about 20 to 25 degrees Centigrade). At an ambient pressure of 1 atmosphere, the general equation is:

mg/m3 = ( ppmv )(12.187)(MW) / (273.15 + °C)

where :

ppmv : ppm by volume
mg/ m3 : milligrams of gaseous pollutant per cubic meter of ambient air
MW : molecular weight of the gaseous pollutant
° C : ambient air temperature in degrees Centigrade

NOTES:

(1) The pollution laws and regulations in the United States typically reference their pollutant limits to an ambient temperature of 20 to 25 °C as noted above. However, in other nations, the reference ambient temperature for pollutant limits may be 0 °C or other values.
(2) 1 percent by volume = 10,000 ppmv (i.e., parts per million by volume).

Pressure Conversions:

Atmospheric pressures may be expressed in a number of different units. The following table provides the conversions between seven of the most commonly used units of pressure.

 

 

atm

psi

1" Hg

kPa

Bar

mm Hg

kg/cm2

1 atm =

1

14.6960000

29.9212600

101.3250000

1.0132500

760.0000000

1.0332280

1 psi =

0.0680460

1

2.0360210

6.8947330

0.0689470

51.7147500

0.0703070

1" Hg =

0.0334211

0.4911541

1

3.3863880

0.0338639

25.4000000

0.0345316

1 kPa =

0.0098690

0.1450380

0.2952999

1

0.0100000

7.5006170

0.0101970

1 bar =

0.9869230

14.5038200

29.5299900

100.0000000

1

750.0616000

1.0197160

1 mm Hg =

0.0013160

0.0193370

0.0393701

0.1333220

0.0013330

1

0.0013600

1 kg/cm2 =

0.9678410

14.2233900

0.0028959

98.0665000

0.9806650

735.5590000

1

 

Although not included in the above table:

  • 1 atmosphere of pressure = 33.90 feet of water = 10.33 meters of water
  • 1 mm Hg = 1 torr

Notes:

atm = absolute pressure, in atmospheres
psi = absolute pressure, in pounds per square inch
kPa = absolute pressure, in kilopascals
bar = absolute pressure, in bars
mm Hg = absolute pressure, in millimeters of Mercury
kg/cm2 = absolute pressure, in kilograms per square centimeter

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