Stack Emission Rate Calculator

Mass emission rate from stack testing data.

Stack flow rate (dscfm)

Pollutant concentration (mg/m³)

Control device efficiency (%)

Annual operating hours

Tab to move between fields

Net emission rate (g/s)

0.01

Net emission rate (lb/hr)0.09

Annual emissions (tons/yr)0.37

Uncontrolled rate (g/s)0.12

Uncontrolled annual (tons/yr)3.75

Pollutant removed (tons/yr)3.37

Exceeds HAP major threshold?0

Exceeds criteria major threshold?0

How to Use This Calculator

Enter Stack flow rate (dscfm), Pollutant concentration (mg/m³), and Control device efficiency (%).
Set Annual operating hours.
Review the Net emission rate (g/s) result.
Use Net emission rate (lb/hr) and Annual emissions (tons/yr) to inform your decision.

How the result changes with Control device efficiency (%)

Stack flow rate (dscfm): Dry standard cubic feet per minute of exhaust gas at standard conditions.
Pollutant concentration (mg/m³): Measured pollutant concentration at the stack in mg per cubic meter.
Control device efficiency (%): Removal efficiency of scrubber, baghouse, or other control device.
Annual operating hours: Hours per year the source operates. 8760 = continuous.

Net emission rate (g/s): Pollutant emission rate after control device, in grams per second.
Net emission rate (lb/hr): Same emission rate expressed in pounds per hour.
Annual emissions (tons/yr): Total controlled emissions over operating hours per year.
Uncontrolled rate (g/s): Emission rate before control device.
Uncontrolled annual (tons/yr): What annual emissions would be without the control device.
Pollutant removed (tons/yr): Amount of pollutant captured by the control device annually.
Exceeds HAP major threshold?: 1 if annual emissions ≥ 10 tons/yr (major source for hazardous air pollutants).
Exceeds criteria major threshold?: 1 if annual emissions ≥ 25 tons/yr (major source for criteria pollutants).

Identify Input Parameters
4 parameters
Stack flow rate (dscfm) = 5000, Pollutant concentration (mg/m³) = 50, Control device efficiency (%) = 90, Annual operating hours = 8000 = 4 input(s) provided
Calculate Net emission rate
Net emission rate = uncontrolledGS * (1 - eta)
0.0118 = 0.0118
Calculate Net emission rate
Net emission rate = netEmissionGS * 7.937
0.094 = 0.094
Calculate Annual emissions
Annual emissions = (netEmissionLbHr * operatingHoursPerYear) / 2000
0.37 = 0.37