Enter the concentration in parts per million (ppm) and select the gas or pollutant to convert the value to micrograms per cubic meter (µg/m³), or use the formula and table below to calculate the conversion manually at 25 °C and 1 atm.
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ppm to ug/m3 Formula
The following formula is used to convert a gas concentration from parts per million (ppm) to micrograms per cubic meter (µg/m³) at standard ambient conditions of 25 °C and 1 atm.
\mu g/m^3 = ppm \times MW \times 1000 / 24.45
Variables:
- µg/m³ is the concentration in micrograms per cubic meter
- ppm is the concentration in parts per million by volume
- MW is the molecular weight of the gas in g/mol
- 24.45 is the molar volume of air in L/mol at 25 °C and 1 atm
To calculate µg/m³, multiply the ppm concentration by the molecular weight of the gas, multiply by 1000, and divide by 24.45. Heavier gases produce larger mass concentrations for the same ppm value because each mole of gas contains more mass.
What is ppm to ug/m3 Conversion?
ppm is a volume-based concentration unit commonly used for gases, while µg/m³ is a mass-per-volume concentration unit. Converting ppm to µg/m³ allows you to compare air quality data, regulatory standards, and monitoring results that may be expressed in different units. Because the conversion depends on molecular weight, each gas has its own conversion factor.
How to Calculate ppm to ug/m3?
The following steps outline how to calculate the equivalent concentration in µg/m³ from a ppm value.
- First, determine the gas concentration in ppm.
- Next, find the molecular weight (MW) of the selected gas or pollutant.
- Then apply the formula: µg/m³ = ppm × MW × 1000 ÷ 24.45.
- Finally, verify the result using the calculator above.
Example Problem:
Use the following values as an example problem to test your knowledge.
ppm = 1
Gas = Carbon Dioxide (CO₂)
µg/m³ = 1 × 44.01 × 1000 ÷ 24.45 = 1800.00
ppm to ug/m3 Conversion Table
The table below shows example conversions for a concentration of 1 ppm for several common gases at 25 °C and 1 atm.
| Gas | Molecular Weight (g/mol) | 1 ppm in µg/m³ |
|---|---|---|
| Carbon Monoxide (CO) | 28.01 | 1,145.60 |
| Carbon Dioxide (CO₂) | 44.01 | 1,800.00 |
| Nitrogen Dioxide (NO₂) | 46.01 | 1,881.80 |
| Sulfur Dioxide (SO₂) | 64.07 | 2,620.45 |
| Ozone (O₃) | 48.00 | 1,963.19 |
| Benzene (C₆H₆) | 78.11 | 3,194.68 |
| Formaldehyde (CH₂O) | 30.03 | 1,228.22 |
In practice, air monitoring reports and environmental standards may use either ppm or µg/m³. Understanding this conversion makes it easier to compare values across different sources, instruments, and regulatory references.