Non-storage Tank Emission Calculations
Non-storage tank air emissions calculations are straightforward. DNR calculates an uncontrolled air emission, a controlled air emission, and an ozone season day.
Uncontrolled Air Emission
An uncontrolled air emission is the air emission calculated before the emission control. If there is no emission control an uncontrolled air emission is equivalent to controlled emission.
E = Throughput x Emission Factor x 1/2000
where
E is the air emission calculation
Throughput is the amount of material processed or burned. This is also known as activity in some emission calculation formulas.
Emission Factor is a number developed from stack tests, material balances or material safety data sheets
1/2000 is the conversion of pounds to tons
Controlled Air Emission
A controlled air emission is the air emission calculated after the emission control. If there is no emission control an controlled air emission is equivalent to uncontrolled emission.
E = Throughput x Emission Factor x 1/2000 x (1-control efficiency)
where
E is the air emission calculation
Throughput is the amount of material processed or burned. This is also known as activity in some emission calculation formulas.
Emission Factor is a number developed from stack tests, material balances or material safety data sheets
1/2000 is the conversion of pounds to tons
1-control efficiency is the control efficiency credited to the collector or other type of control device. Control efficiency is expressed in percentages and so that is why the control efficiency is subtracted from 1.
Ozone Season Day
An ozone season day is calculated because DNR must report typical ozone season day emission values to USEPA.
A typical ozone season day is defined as a day from July to September (3rd quarter of the calendar year) in which reactive organic gasses or nitrogen oxides are emitted and contribute to the generation of ground-level ozone. If your air emission summary contains an ozone season day value, you can verify this calculation by using the following equation:
EM = ([ANNUAL X 3rd quarter percentage]/ [DPW X 13]) X 2000
where
EM = typical ozone season day
ANNUAL = annual emissions of ROG or NOx in tons. Ozone season days are used for ozone calculation and so the only two air pollutants used are Reactive Organic Gases (ROG) and nitrous oxides (NOx).
DPW = days per week the facility operates as reported to DNR
13 = number of weeks in the ozone season months from July to September
2000 = conversion from pounds to tons
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