Micrograms per Cubic Metre (μg/m3) / Parts per Billion (PPB) Converter and Milligrams per Cubic Metre (mg/m3) / Parts per Million (PPM) Converter
The following calculators allow for the conversion of concentrations for a variety of pollutants between micrograms per cubic metre (µgm-3) and parts per billion (ppb), and between milligrams per cubic metre (mgm-3) and parts per million (ppm). A concentration in ppb (by volume) is the volume of a gaseous compound per billion volumes of ambient air whereas a concentration in µgm-3 is the mass of a gaseous compound (in µg) per cubic metre of ambient air.
This tool allows the user to convert between ambient concentration units at measurement temperatures (to a reference temperature of 0 degrees Celsius). It is particularly useful for standardising measurements taken for environmental studies.
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Table of Common Gasses and Molecular Weights
For quick and easy reference, see the table below with a list of common gasses and their molecular weights. (Source: Interscan Corporation)
| Compound | Formula | Molecular Weight (g/mol) |
|---|---|---|
| Ammonia | NH3 | 17.031 |
| Arsine | AsH3 | 77.945 |
| Benzene | C6H6 | 78.114 |
| Bromine | Br2 | 159.808 |
| Carbon disulfide | CS2 | 76.143 |
| Carbon monoxide | CO | 28.01 |
| Carbon tetrachloride | CCl4 | 153.822 |
| Chlorine | Cl2 | 70.905 |
| Chlorine dioxide | ClO2 | 67.452 |
| Dimethyl sulfide | (CH3)S | 62.136 |
| Ethylene | C2H4 | 28.054 |
| Ethylene oxide | H2COCH2 | 44.053 |
| Formaldehyde | HCHO | 30.026 |
| Hydrazine | H2NNH2 | 32.045 |
| Hydrogen | H2 | 2.016 |
| Hydrogen bromide | HBr | 80.912 |
| Hydrogen chloride | HCl | 36.461 |
| Hydrogen cyanide | HCN | 27.026 |
| Hydrogen peroxide | H2O2 | 34.015 |
| Hydrogen sulfide | H2S | 34.082 |
| Methyl mercaptan | CH3SH | 48.109 |
| Monomethyl hydrazine | CH3NHNH2 | 46.072 |
| Nitric oxide | NO | 30.006 |
| Nitrogen dioxide | NO2 | 46.006 |
| Nitrogen tetroxide | N2O4 | 92.011 |
| Ozone | O3 | 47.998 |
| Peracetic acid | CH3COOOH | 76.051 |
| Phosphine | PH3 | 33.998 |
| Propylene oxide | CH3CHOCH2 | 58.08 |
| Silane | SiH4 | 32.117 |
| Sulfur dioxide | SO2 | 64.065 |
| Sulfuryl fluoride | SO2F2 | 102.062 |
| Unsymmetrical dimethyl hydrazine | (CH3)2NNH2 | 60.0984 |
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Disclaimer
Please note that this or any other calculators on the wkcgroup.com tools room are for information only. WKC Group has endeavoured to ensure that the information presented here is accurate and that the calculations are correct, but will not accept responsibility for any consequential damages, faults or human errors that may arise from the use of formulas, inventories and values.
