Emission estimation calculators, booklet 1: chapter 2

Fugitive Dust Emissions from Aggregate Handling

Aggregate handling includes material loading onto a storage pile and load-out from the pile onto a receiving surface. These drop operations may be batch or continuous. The substances of concern in this activity are Criteria Air Contaminants (Part 4 Substances). Note that emissions from wind erosion or from loader/truck traffic around the storage pile may need to be considered as well.

Download spreadsheet calculator: Aggregate Handling Emissions  [xls 84 KB] (4 Feb 2009)

Suggested estimation methodology: Calculated Emission Factor

The general equation for emissions estimation is:

E = A x EF


  • E = emissions
  • A = activity rate
  • EF = emission factor

Input Data and Release Calulations

The emission factors for estimating particulate emissions from a drop operation can be calculated as a function of the particle size, mean wind speed, and material moisture content. The methodology is explained in detail in chapter 13.2 of the U.S. Environmental Protection Agency (EPA) AP-42 document and summarized here.

  1. Determine M, the moisture content of the material (should be between 0.25 - 4.8%).

  2. Determine U, the annual mean wind speed for your area. Annual mean wind speed data is available at the Climate Data web site. You will need to convert the data to units of m/s.

  3. Calculate the emission factorsFootnote1 for Total Particulate Matter (TPM)Footnote*, Particulate Matter less than or equal to 10 micrometers (µm) (PM10)Footnote* and Particulate Matter less than or equal to 2.5 µm (PM2.5)Footnote* using these formulas:

    EFTPM = 0.74(0.0016)[(U/2.2)1.3 / (M/2)1.4]     (kilograms (kg)/tonne)
    EFPM10 = 0.35(0.0016)[(U/2.2)1.3 / (M/2)1.4]     (kg/tonne)
    EFPM2.5 = 0.053(0.0016)[(U/2.2)1.3/ (M/2)1.4]     (kg/tonne)

  4. Use the calculated emission factors to determine the annual emissions of each substance using the general equation for emissions estimation:

    E = A x EF

    • E = annual emissions (kg)
    • A = activity rate (tonnes of aggregate loaded per year).
    • EF = emission factor (kg/tonne)

    Do this calculation separately for each substance
    (i.e. ETPM = A x EFTPM, EPM10= A x EFPM10, and EPM2.5 = A x EFPM2.5)

Note on Emissions Factors

The default emission factors are used in the table above, however if you have a site specific emission factor you would prefer to use you may enter it in the emission factor column. If you choose to insert your own emission factor ensure that the units have been converted accordingly. 

Except where indicated, the emission factors used in this spreadsheet are based on uncontrolled emissions. If you are using an emission control device you will have to adjust the emissions calculated by this spreadsheet according to the following formula:

Controlled Emissions = Uncontrolled emission x ((100 - control efficiency)/100)

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