PPM to ng/J Converter NOx, SO₂, CO, THC, O₂, CO₂

PPM to ng/J Converter (NOx, SO₂, CO, THC, O₂, CO₂)

Gross Calorific Value (MJ/m³):

Gas	PPM	ng/J
NOx (as NO₂)		—
SO₂		—
CO		—
THC (as CH₄)		—
O₂		—
CO₂		—

✅ General Formula:

$$\text{Emission (ng/J)} = \frac{\text{PPM} \times MW \times 1000}{22.4 \times \text{GCV}}$$

Where:

• PPM = concentration in parts per million

• MW = molecular weight (g/mol) of the compound

• 22.4 = molar volume at standard conditions (L/mol)

• GCV = Gross Calorific Value (MJ/m³) of the fuel

• 1000 = converts grams to milligrams and m³ to liters

💡 Assumes standard temperature and pressure (0°C, 1 atm)

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✅ Molecular Weights (MW) for Gases:

Compound	Symbol	MW (g/mol)
Nitrogen Oxides	NOx (as NO₂)	46.01
Sulfur Dioxide	SO₂	64.07
Carbon Monoxide	CO	28.01
Total Hydrocarbons	THC (as CH₄)	16.04
Oxygen	O₂	32.00
Carbon Dioxide	CO₂	44.01