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mg/m³ to ppm Converter (Gas Concentration)

Industrial hygiene tool for converting gas concentration. Features a database of Molecular Weights and STP adjustments for accurate environmental safety calculations.

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About

Air quality standards for workplace safety (OSHA/NIOSH) often specify exposure limits in ppm (parts per million), while monitoring equipment may output raw data in mg/m3. Converting between these requires more than a simple multiplier; it is dependent on the physics of the specific gas.

This calculator applies the Ideal Gas Law to bridge the units. Since the volume a gas occupies depends on temperature and pressure, valid conversions must account for these environmental variables. While standard conditions (STP) are often assumed, this tool allows for real-world adjustments - essential for hygienists working in high-altitude mines or heated industrial processes.

air quality industrial hygiene gas conversion ppm calculator environmental engineering

Formulas

The formula derives from the molar volume of an ideal gas.

ppm = Cmg/m3 × VmMW

Where Vm (Molar Volume) is calculated based on Temperature (T in °C) and Pressure (P in atm):

Vm = 24.45 × 273.15 + T298.15 × 1P

Reference Data

Gas NameFormulaMolecular Weight (g/mol)
AmmoniaNH317.03
Carbon MonoxideCO28.01
OzoneO348.00
Nitrogen DioxideNO246.01
Sulfur DioxideSO264.07
BenzeneC6H678.11

Frequently Asked Questions

Standard Temperature and Pressure for industrial hygiene is typically defined as 25°C (298.15 K) and 1 atmosphere (760 mmHg). Under these conditions, the molar volume of an ideal gas is 24.45 L/mol.
Yes, significantly. For the same weight of gas in air (mg/m³), lighter gases (low MW) will have a higher ppm count because there are more individual molecules present.