Measure nitrogen dioxide values with chemistry inputs. Compare exposure, mass flow, and concentration results quickly. Use this tool to support clearer air analysis work.
| Scenario | Input | Temp (°C) | Pressure (kPa) | Flow | Result (ppb) | Mass Flow (mg/s) |
|---|---|---|---|---|---|---|
| Urban street check | 40 ppb | 25 | 101.325 | 120 m3/h | 40.00 | 0.002298 |
| Stack screening | 0.09 ppm | 30 | 100.000 | 200 m3/h | 90.00 | 0.008366 |
| Indoor lab review | 180 ug/m3 | 20 | 101.325 | 90 m3/h | 102.67 | 0.004500 |
| Combustion outlet | 0.12 mg/m3 | 18 | 99.500 | 75 m3/h | 69.22 | 0.002500 |
This calculator uses nitrogen dioxide molecular weight of 46.0055 g/mol.
1. ppm from ppb = ppb / 1000
2. mg/m3 = ppm × 46.0055 / 24.45 × (273.15 / (273.15 + T)) × (P / 101.325)
3. ug/m3 = mg/m3 × 1000
4. Mass flow (mg/s) = concentration (mg/m3) × flow (m3/s)
5. Total mass (mg) = mass flow (mg/s) × duration (s)
6. Exposure load (ug·h/m3) = concentration (ug/m3) × duration (h)
7. Moles per m3 = (mg/m3 ÷ 1000) ÷ 46.0055
Enter a site name for your record.
Add the measured nitrogen dioxide value.
Select the matching concentration unit.
Enter local temperature and pressure.
Add the gas flow rate and unit.
Enter the monitoring or exposure duration.
Press the calculate button.
Read converted concentration values, mass flow, total mass, and exposure load.
Use the CSV button to save results.
Use the PDF button to print or save the page as a PDF.
Nitrogen dioxide is a common reactive gas. It appears in traffic zones, boilers, furnaces, and combustion systems. Chemists and environmental teams track it because it affects air quality, corrosion risk, and process control. A clear concentration estimate helps teams compare readings across sites and time periods.
This calculator converts nitrogen dioxide input values into several useful outputs. It can turn ppb into ppm. It can also convert gas concentration into mg/m3 and ug/m3. That helps when reports, sensors, and regulations use different units. The tool also estimates mass flow when a gas stream volume is known.
Gas concentrations change with operating conditions. Temperature changes gas density. Pressure changes the amount of gas in the same space. A chemistry calculator should account for both. That is why this page includes temperature and pressure fields. These inputs improve conversion accuracy for practical monitoring work.
You can use this page for stack screening, indoor lab checks, process exhaust reviews, and air monitoring exercises. It also helps with educational chemistry problems. Students can see how molar mass, gas laws, and flow rate combine in one result set. Plant teams can estimate loading over a shift or an entire day.
The result block shows converted concentrations first. Then it shows flow based outputs. Mass flow gives the amount of nitrogen dioxide moving each second. Total mass shows the amount over the selected duration. Exposure load gives a quick time weighted view. These values support comparison, reporting, and planning.
This calculator is designed for estimation and screening. Field calibration, official compliance methods, and certified instruments still matter. Use the values as a strong starting point. Then compare them with your site method, local requirement, or laboratory standard before making final environmental decisions.
Enter the unit that matches your measured value. The calculator accepts ppb, ppm, ug/m3, and mg/m3. It converts everything into comparable nitrogen dioxide outputs for easier review.
Temperature changes gas volume and density. A warmer gas spreads out more. That changes the mass concentration linked to the same volumetric reading. Including temperature makes the conversion more realistic.
Pressure affects how many gas molecules fit into a given space. Higher pressure usually means greater mass concentration for the same ppm value. The calculator adjusts for that effect.
Mass flow shows how much nitrogen dioxide passes through a gas stream each second. It combines concentration and volume flow. This is useful for emissions estimates and process tracking.
Yes. It can support indoor reviews, especially when readings must be converted between ppb and mass units. Use site specific sampling methods when you need formal compliance or certification.
Exposure load is the concentration over time, shown here as ug·h/m3. It helps compare short events and longer periods using one simple screening value.
Yes. It is useful for chemistry, environmental science, and process calculations. It connects molar mass, gas conversions, and flow based results in one place.
No. It is a screening and planning tool. Certified instruments, approved methods, and official reporting procedures are still required when legal or compliance decisions depend on the result.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.