Hot mix asphalt plants

Download the hot mix asphalt calculator to help you estimate releases of National Pollutant Release Inventory (NPRI) substances.

Hot mix asphalt (HMA) plants can release substances from Part 1, 4 and 5. (Part 2 substances – PAHs – are also released from asphalt plants but these releases need not be reported as they are considered to be intentional.)

The calculator focusses on releases to air and uses default emission factors. It can be adapted to use site-specific emission factors. If you want to use a site-specific emission factor, enter it in the emission factor column, but be sure to convert the units correctly. 

The spreadsheet calculators use emission factors based on uncontrolled emission sources. If you use an emission control device and the default emission factor is uncontrolled, use this formula to adjust the spreadsheet calculation:

Controlled emissions = uncontrolled emission x ((100 - control efficiency)/100)

Since NPRI reporting thresholds are for the facility as a whole, you may need to combine the air releases you calculate with releases from other sources at your facility.

The following sections explain how the spreadsheet calculator works.

Suggested estimation methodology: emission factor

The general equation for estimation using an emissions factor is:

E = A x EF

where:

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

Part 1 substance releases

Process: batch mix plants with fabric filter

Emissions can be calculated using published emission factors.

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for batch mix plants with fabric filter

Substance Chemical Abstracts Service Registry Number (CAS RN)Footnote 1 Part Emission factor (EF)Footnote 2 EF units
Acetaldehyde 75-07-0 1A 1.600E-04 kilograms (kg)/tonne
Benzene 71-43-2 1A 1.400E-04 kg/tonne
Ethylbenzene 100-41-4 1A 1.100E-03 kg/tonne
Formaldehyde 50-00-0 1A 3.700E-04 kg/tonne
Isobutyraldehyde 78-84-2 1A 1.500E-05 kg/tonne
Toluene 108-88-3 1A 5.000E-04 kg/tonne
Anthracene 120-12-7 1A 1.050E-07 kg/tonne
Naphthalene 91-20-3 1A 1.800E-05 kg/tonne
Crotonaldehyde 4170-30-3 1A 1.450E-05 kg/tonne
Xylene 1330-20-7 1A 1.350E-03 kg/tonne
Chromium Footnote *   1A 2.850E-07 kg/tonne
Copper Footnote *   1A 1.400E-06 kg/tonne
Manganese Footnote *   1A 3.450E-06 kg/tonne
Nickel Footnote *   1A 1.500E-06 kg/tonne
Zinc Footnote *   1A 3.400E-06 kg/tonne
Arsenic Footnote *   1B 2.300E-07 kg/tonne
Cadmium Footnote *   1B 3.050E-07 kg/tonne
Hexavalent chromium Footnote *   1B 2.400E-08 kg/tonne
Lead (NG, #2 oil) Footnote *   1B 4.450E-07 kg/tonne
Mercury Footnote *   1B 2.050E-07 kg/tonne
Selenium Footnote *   1B 2.450E-07 kg/tonne
Lead (#6 oil) Footnote *   1B 5.000E-06 kg/tonne

 

Process: drum mix plants with natural gas-fired dryer with fabric filter

Emissions can be calculated using published emission factors.

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix plants with natural gas-fired dryer with fabric filter

Substance name CAS RNFootnote 1  Part Emission factorFootnote 2  EF units
Antimony Footnote *   1A 9.000E-08 kg/tonne
Benzene 71-43-2 1A 1.950E-04 kg/tonne
Ethylbenzene 100-41-4 1A 1.200E-04 kg/tonne
Formaldehyde 50-00-0 1A 1.550E-03 kg/tonne
n-Hexane 110-54-3 1A 4.600E-04 kg/tonne
Toluene 108-88-3 1A 7.500E-05 kg/tonne
Anthracene 120-12-7 1A 1.100E-07 kg/tonne
Naphthalene 91-20-3 1A 4.500E-05 kg/tonne
Xylene 1330-20-7 1A 1.000E-04 kg/tonne
Chromium Footnote * 1A 2.750E-06 kg/tonne
Copper Footnote * 1A 1.550E-06 kg/tonne
Manganese Footnote * 1A 3.850E-06 kg/tonne
Nickel Footnote * 1A 3.150E-05 kg/tonne
Silver Footnote * 1A 2.400E-07 kg/tonne
Phosphorus Footnote * 1A 1.400E-05 kg/tonne
Zinc Footnote * 1A 3.050E-05 kg/tonne
Ethylene 74-85-1 1A 3.500E-03 kg/tonne
Arsenic Footnote * 1B 2.800E-07 kg/tonne
Cadmium Footnote * 1B 2.050E-07 kg/tonne
Cobalt Footnote * 1B 1.300E-08 kg/tonne
Hexavalent chromium Footnote * 1B 2.250E-07 kg/tonne
Lead Footnote * 1B 3.100E-07 kg/tonne
Mercury Footnote * 1B 1.200E-07 kg/tonne
Selenium Footnote * 1B 1.750E-07 kg/tonne

Process: drum mix plants with no. 2 fuel oil-fired dryer - fabric filter

Emissions can be calculated using published emission factors.

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix plants with no. 2 fuel oil-fired dryer - fabric filter

Substance name CAS RNFootnote 1  Part Emission factorFootnote 2  EF units
Antimony Footnote *   1A 9.000E-08 kg/tonne
Benzene 71-43-2 1A 1.950E-04 kg/tonne
Ethylbenzene 100-41-4 1A 1.200E-04 kg/tonne
Formaldehyde 50-00-0 1A 1.550E-03 kg/tonne
n-Hexane 110-54-3 1A 4.600E-04 kg/tonne
Toluene 108-88-3 1A 1.450E-03 kg/tonne
Anthracene 120-12-7 1A 1.550E-06 kg/tonne
Naphthalene 91-20-3 1A 3.250E-04 kg/tonne
Ethylene 74-85-1 1A 3.500E-03 kg/tonne
Xylene 1330-20-7 1A 1.000E-04 kg/tonne
Chromium Footnote *   1A 2.750E-06 kg/tonne
Copper Footnote *   1A 1.550E-06 kg/tonne
Manganese Footnote *   1A 3.850E-06 kg/tonne
Nickel Footnote *   1A 3.150E-05 kg/tonne
Phosphorus Footnote *   1A 1.400E-05 kg/tonne
Zinc Footnote *   1A 3.050E-05 kg/tonne
Silver Footnote *   1A 2.400E-07 kg/tonne
Arsenic Footnote *   1B 2.800E-07 kg/tonne
Cadmium Footnote *   1B 2.050E-07 kg/tonne
Cobalt Footnote *   1B 1.300E-08 kg/tonne
Hexavalent chromium Footnote *   1B 2.250E-07 kg/tonne
Lead Footnote *   1B 7.500E-06 kg/tonne
Mercury Footnote *   1B 1.300E-07 kg/tonne
Selenium Footnote *   1B 1.750E-07 kg/tonne
Thallium Footnote *   1B 2.050E-09 kg/tonne

Process: drum mix plants with waste/no. 6 fuel oil-fired dryer - fabric filter

Emissions can be calculated using published emission factors.

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix plants w/waste/no. 6 fuel oil-fired dryer - fabric filter

Substance name CAS RNFootnote 1  Part Emission factorFootnote 2  EF units
Acetaldehyde 75-07-0 1A 6.500E-04 kg/tonne
Acrolein 107-02-8 1A 1.300E-05 kg/tonne
Antimony Footnote *   1A 9.000E-08 kg/tonne
Benzene 71-43-2 1A 1.950E-04 kg/tonne
Butyraldehyde 123-72-8 1A 8.000E-05 kg/tonne
Ethylbenzene 100-41-4 1A 1.200E-04 kg/tonne
Formaldehyde 50-00-0 1A 1.550E-03 kg/tonne
n-Hexane 110-54-3 1A 4.600E-04 kg/tonne
Hydrochloric acid 7647-01-0 1A 1.050E-04 kg/tonne
Methyl ethyl ketone 78-93-3 1A 1.000E-05 kg/tonne
Propionaldehyde 123-38-6 1A 6.500E-05 kg/tonne
Toluene 108-88-3 1A 1.450E-03 kg/tonne
Anthracene 120-12-7 1A 1.550E-06 kg/tonne
Naphthalene 91-20-3 1A 3.250E-04 kg/tonne
Xylene 1330-20-7 1A 1.000E-04 kg/tonne
Chromium Footnote *   1A 2.750E-06 kg/tonne
Copper Footnote *   1A 1.550E-06 kg/tonne
Manganese Footnote *   1A 3.850E-06 kg/tonne
Nickel Footnote *   1A 3.150E-05 kg/tonne
Phosphorus Footnote *   1A 1.400E-05 kg/tonne
Zinc Footnote *   1A 3.050E-05 kg/tonne
Ethylene 74-85-1 1A 3.500E-03 kg/tonne
Crotonaldehyde 4170-30-3 1A 4.300E-05 kg/tonne
Silver Footnote *   1A 2.400E-07 kg/tonne
Arsenic Footnote *   1B 2.800E-07 kg/tonne
Cadmium Footnote *   1B 2.050E-07 kg/tonne
Cobalt Footnote *   1B 1.300E-08 kg/tonne
Hexavalent chromium Footnote *   1B 2.250E-07 kg/tonne
Lead Footnote *   1B 7.500E-06 kg/tonne
Mercury Footnote *   1B 1.300E-07 kg/tonne
Selenium Footnote *   1B 1.750E-07 kg/tonne
Thallium Footnote *   1B 2.050E-09 kg/tonne

Process: asphalt heater - natural gas boilers <10 million British thermal units per hour (MMBTU/hr)

Emissions can be calculated using published emission factors.

Input: A = Amount of natural gas fuel used in the asphalt cement storage heater (cubic meters (m3)/year)

Emission factors for asphalt heater - natural gas boilers <10 MMBTU/hr

Substance name CAS RNFootnote 1  Part Emission factorFootnote 2  EF units
Benzene 71-43-2 1A 3.364E-02 kg/10^6m^3
Chromium Footnote *   1A 2.243E-02 kg/10^6m^3
Copper Footnote *   1A 1.362E-02 kg/10^6m^3
Formaldehyde 50-00-0 1A 1.201E+00 kg/10^6m^3
n-Hexane 110-54-3 1A 2.883E+01 kg/10^6m^3
Manganese Footnote *   1A 6.087E-03 kg/10^6m^3
Naphthalene 91-20-3 1A 9.771E-03 kg/10^6m^3
Nickel Footnote *   1A 3.364E-02 kg/10^6m^3
Toluene 108-88-3 1A 5.446E-02 kg/10^6m^3
Zinc Footnote *   1A 4.645E-01 kg/10^6m^3
Arsenic Footnote *   1B 0.003 kg/10^6m^3
Cadmium Footnote *   1B 0.018 kg/10^6m^3
Cobalt Footnote *   1B 1.346E-03 kg/10^6m^3
Lead Footnote *   1B 0.008 kg/10^6m^3
Mercury Footnote *   1B 0.004 kg/10^6m^3

Process: asphalt heater - waste oil

Emissions can be calculated using published emission factors.

Inputs:

A = Amount of waste oil used in the asphalt cement storage heater (litres/year)

% Pb = Lead (Pb) content in waste/No. 6 fuel oil (U.S. Environmental Protection Agency (USEPA) default = 0% Pb)

% Cl = Chlorine (Cl) content in fuel (USEPA default = 0% Cl)

Emission factors for asphalt heaters burning waste oil
Substance name CAS RNFootnote 1 Part Emission factorFootnote 2 EF units
Chromium Footnote *   1A 2.397E-03 kg/1000 litres (L)
Manganese Footnote *   1A 8.148E-03 kg/1000L
Nickel Footnote *   1A 1.318E-03 kg/1000L
Hydrochloric Acid 7647-01-0 1A 7.91 x %Cl kg/1000L
Arsenic Footnote *   1B 1.318E-02 kg/1000L
Cadmium Footnote *   1B 1.114E-03 kg/1000L
Cobalt Footnote *   1B 2.516E-05 kg/1000L
Lead Footnote *   1B 6.59 x %Pb kg/1000L

Process: load-out and yard emissions

The emission factors are a function of asphalt volatility and mix temperature. To calculate the emission factors, use the formula (where EFTOC represents 'emission factor for total organic carbon':

EFTOC  = 0.00172(-V) e((0.0251)(T+460)-20.43) (kg/tonne)

Inputs:

A= Total hot-mix asphalt produced (tonnes/year)
V = Asphalt volatility (USEPA default = -0.5)
T = HMA mix temperature (USEPA default = 325 F)

Emission factors for load-out and yard emissions
Substance name CAS RNFootnote 1 Weight %Footnote ** Emission factorFootnote 2 EF units
Ethylene 74-85-1 0.71 = EFTOC x Wt% (percentage by mass)/100  kg/tonne
Benzene 71-43-2 0.052 = EFTOC  x Wt%/100  kg/tonne
Bromomethane 74-83-9 0.0096 = EFTOC  x Wt%/100  kg/tonne
Carbon disulfide 75-15-0 0.013 = EFTOC  x Wt%/100  kg/tonne
Chloroethane 75-00-3 0.00021 = EFTOC  x Wt%/100  kg/tonne
Chloromethane 74-87-3 0.015 = EFTOC  x Wt%/100  kg/tonne
Cumene 92-82-8 0.11 = EFTOC  x Wt%/100  kg/tonne
Ethylbenzenene 100-41-4 0.28 = EFTOC  x Wt%/100  kg/tonne
Formaldehyde 50-00-0 0.088 = EFTOC  x Wt%/100  kg/tonne
n-Hexane 110-54-3 0.15 = EFTOC  x Wt%/100  kg/tonne
Styrene 100-42-5 0.0073 = EFTOC  x Wt%/100  kg/tonne
Tetrachloroethylene 127-18-4 0.0077 = EFTOC  x Wt%/100  kg/tonne
Toluene 108-88-3 0.21 = EFTOC  x Wt%/100  kg/tonne
Xylene 1330-20-7 0.49 = EFTOC  x Wt%/100  kg/tonne
Anthracene 120-12-07 0.07 = EFTOC  x Wt%/100  kg/tonne
Naphthalene 91-20-3 1.25 = EFTOC  x Wt%/100  kg/tonne
Phenol 108-95-2 1.18 = EFTOC  x Wt%/100  kg/tonne

Process: silo filling and asphalt storage tank emissions

The emission factors are a function of asphalt volatility and mix temperature. To calculate the emission factor, use the formula (where EFTOC represents 'emission factor for total organic carbon':

EFTOC  = 0.5* 0.0504(-V)e((0.0251)(T+460)-20.43)   (kg/tonne)

Inputs:

A = Total hot-mix asphalt produced (tonnes/year)
V = Asphalt volatility (USEPA default = -0.5)
T = HMA mix temperature (USEPA default = 325 F)

Emission factors for silo filling and asphalt storage tank emissions
Substance name CAS RNFootnote 1 Weight %Footnote ** Emission factorFootnote 2 EF units
Ethylene 74-85-1 1.1 =EFTOC*Wt%/100  kg/tonne
Benzene 71-43-2 0.032 =EFTOC*Wt%/100  kg/tonne
Bromomethane 74-83-9 0.0049 =EFTOC*Wt%/100  kg/tonne
Carbon disulfide 75-15-0 0.016 =EFTOC*Wt%/100  kg/tonne
Chloroethane 75-00-3 0.004 =EFTOC*Wt%/100  kg/tonne
Chloromethane 74-87-3 0.023 =EFTOC*Wt%/100  kg/tonne
Ethylbenzene 100-41-4 0.038 =EFTOC*Wt%/100  kg/tonne
Formaldehyde 50-00-0 0.69 =EFTOC*Wt%/100  kg/tonne
n-Hexane 110-54-3 0.1 =EFTOC*Wt%/100  kg/tonne
Styrene 100-42-5 0.0054 =EFTOC*Wt%/100  kg/tonne
Toluene 108-88-3 0.062 =EFTOC*Wt%/100  kg/tonne
Xylene 1330-20-7 0.257 =EFTOC*Wt%/100  kg/tonne
Anthracene 120-12-7 0.13 =EFTOC*Wt%/100  kg/tonne
Naphthalene 91-20-3 1.82 =EFTOC*Wt%/100  kg/tonne

Part 4 substance releases

Process: batch mix - natural gas fired dryer, hot screens and mixer, uncontrolled

Emissions can be calculated using published emission factors.

Inputs: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for batch mix - Natural gas fired dryer, hot screens and mixer, uncontrolled
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 2.000E-01 kg/tonne
Sulphur dioxide (SO2) 7446-09-5 2.300E-03 kg/tonne
Oxides of nitrogen (NOx), expressed as nitrogen dioxide (NO2) 11104-93-1 1.250E-02 kg/tonne
Volatile organic compounds (VOCs) Footnote *   4.100E-03 kg/tonne
Total particulate matter (TPM) Footnote *   1.600E+01 kg/tonne
Particulate matter less than or equal to 10 µm (PM10) Footnote *   2.250E+00 kg/tonne
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   1.350E-01 kg/tonne

Process: batch mix - no. 2 fuel oil-fired dryer, hot screens and mixer, uncontrolled

Emissions can be calculated using published emission factors.

Inputs: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for batch mix - No. 2 fuel oil-fired dryer, hot screens and mixer, uncontrolled
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 2.000E-01 kg/tonne
Sulphur dioxide (SO2) 7446-09-5 4.400E-02 kg/tonne
Oxides of nitrogen, expressed as NO2 (NOx) 11104-93-1 6.000E-02 kg/tonne
Volatile organic compounds (VOCs) Footnote *   4.100E-03 kg/tonne
Total particulate matter (TPM) Footnote *   1.600E+01 kg/tonne
Particulate matter less than or equal to 10 µm (PM10) Footnote *   2.250E+00 kg/tonne
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   1.350E-01 kg/tonne

Process: batch mix - waste/drain/no. 6 fuel oil-fired dryer, hot screens and mixer, uncontrolled

Emissions can be calculated using published emission factors.

Inputs: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for batch mix - Waste/drain/No. 6 fuel oil-fired dryer, hot screens and mixer, uncontrolled
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 2.000E-01 kg/tonne
Sulphur dioxide (SO2) 7446-09-5 4.400E-02 kg/tonne
Oxides of nitrogen, expressed as NO2 (NOx) 11104-93-1 6.000E-02 kg/tonne
Volatile organic compounds (VOCs) Footnote *   1.800E-02 kg/tonne
Total particulate matter (TPM) Footnote *   1.600E+01 kg/tonne
Particulate matter less than or equal to 10 µm (PM10) Footnote *   2.250E+00 kg/tonne
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   1.350E-01 kg/tonne

Process: drum mix - natural gas-fired rotary dryer/mixer, uncontrolled

Emissions can be calculated using published emission factors.

Inputs: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix - Natural gas-fired rotary dryer/mixer, uncontrolled
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 6.500E-02 kg/tonne
Sulphur dioxide (SO2) 7446-09-5 1.700E-03 kg/tonne
Oxides of nitrogen, expressed as NO2 (NOx) 11104-93-1 1.300E-02 kg/tonne
Volatile organic compounds (VOCs) Footnote *   1.600E-02 kg/tonne
Total particulate matter (TPM) Footnote *   1.400E+01 kg/tonne
Particulate matter less than or equal to 10 µm (PM10) Footnote *   3.200E+00 kg/tonne
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   7.500E-01 kg/tonne

Process: drum mix - no. 2 oil-fired rotary dryer/mixer, uncontrolled

Emissions can be calculated using published emission factors.

Inputs: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix - No. 2 oil-fired rotary dryer/mixer, uncontrolled
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 6.500E-02 kg/tonne
Sulphur dioxide (SO2) 7446-09-5 5.500E-03 kg/tonne
Oxides of nitrogen, expressed as NO2 (NOx) 11104-93-1 2.750E-02 kg/tonne
Volatile organic compounds (VOCs) Footnote *   1.600E-02 kg/tonne
Total particulate matter (TPM) Footnote *   1.400E+01 kg/tonne
Particulate matter less than or equal to 10 µm (PM10) Footnote *   3.200E+00 kg/tonne
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   7.500E-01 kg/tonne

Process: drum mix - waste/drain/no.6 oil-fired rotary dryer/mixer, uncontrolled

Emissions can be calculated using published emission factors.

Inputs: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix - Waste/drain/No.6 oil-fired rotary dryer/mixer, uncontrolled
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 6.500E-02 kg/tonne
Sulphur dioxide (SO2) 7446-09-5 2.900E-02 kg/tonne
Oxides of nitrogen, expressed as NO2 (NOx) 11104-93-1 2.750E-02 kg/tonne
Volatile organic compounds (VOCs) Footnote *   1.600E-02 kg/tonne
Total particulate matter (TPM) Footnote *   1.400E+01 kg/tonne
Particulate matter less than or equal to 10 µm (PM10) Footnote *   3.200E+00 kg/tonne
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   7.500E-01 kg/tonne

Process: asphalt heater - natural gas

Emissions can be calculated using published emission factors.

Inputs: A = Amount of natural gas fuel used in the asphalt cement storage heater (m3/year)

Emission factors for asphalt heaters burning natural gas
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 1345.551 kg/10^6m^3
Sulphur dioxide (SO2) 7446-09-5 9.611 kg/10^6m^3
Oxides of nitrogen, expressed as NO2 (NOx) 11104-93-1 1601.846 kg/10^6m^3
Volatile organic compounds (VOCs) Footnote *   88.102 kg/10^6m^3
Total particulate matter (TPM) Footnote *   30.435 kg/10^6m^3
Particulate matter less than or equal to 10 µm (PM10) Footnote *   30.435 kg/10^6m^3
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   30.435 kg/10^6m^3

Process: asphalt heater - waste oil

Emissions can be calculated using published emission factors.

Inputs: A = Amount of waste oil used in the asphalt cement storage heater (litres/year)

Emission factors for asphalt heaters burning waste oil
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Carbon monoxide (CO) 630-08-0 5.991E-01 kg/1000L
Sulphur dioxide (SO2) 7446-09-5 4.509E+00 kg/1000L
Oxides of nitrogen, expressed as NO2 (NOx) 11104-93-1 2.277E+00 kg/1000L
Total particulate matter (TPM) Footnote *   2.784E+00 kg/1000L
Particulate matter less than or equal to 10 µm (PM10) Footnote *   2.218E+00 kg/1000L
Particulate matter less than or equal to 2.5 µm (PM2.5) Footnote *   1.253E+00 kg/1000L

Other emission sources: speciation profile for load-out and yard emissions

The emission factors are a function of asphalt volatility and mix temperature. They are calculated with these formulae (where EFTOC represents 'emission factor for total organic carbon', EFCO represents 'emission factor for carbon monoxide':

EFCO  = 0.5* 0.00558(-V)e((0.0251)(T+460)-20.43) (kg/tonne)

EFTOC  = 0.00172(-V) e((0.0251)(T+460)-20.43) (kg/tonne)

Inputs:

V = Asphalt volatility (USEPA default = -0.5)
T = HMA mix temperature (USEPA default = 325 F)
A = Total hot-mix asphalt produced (tonnes/year)

Other emission sources: Speciation profile for load-out and yard emissions
Substance name CAS RNFootnote 1 Weight %Footnote ** Emission factorFootnote 2 EF units
Carbon monoxide (CO) 630-08-0 NA = EFCO kg/tonne
Volatile organic compounds (VOCs) Footnote *   94 =EFTOC x Wt%VOC/100    kg/tonne

Other emission sources: speciation profile for silo filling and asphalt storage tank emissions

The emission factors are a function of asphalt volatility and mix temperature. They are calculated with these formulae (where EFTOC represents 'emission factor for total organic carbon', EFCO represents 'emission factor for carbon monoxide’:

EFCO  = 0.5* 0.00488(-V)e((0.0251)(T+460)-20.43)) (kg/tonne)

EFTOC  = 0.5* 0.0504(-V)e((0.0251)(T+460)-20.43) (kg/tonne)

Inputs:

V = Asphalt volatility (USEPA default = -0.5)
T = HMA mix temperature (USEPA default = 325 F)
A = Hot-mix asphalt produced (tonnes/year)

Other emission sources: Speciation profile for silo filling and asphalt storage tank emissions
Substance name CAS RNFootnote 1 Weight %Footnote ** Emission factorFootnote 2 EF units
Carbon monoxide (CO) 630-08-0 NA = EFCO kg/tonne
Volatile organic compounds (VOCs) Footnote* 100 =EFTOC * Wt%VOC/100    kg/tonne

Part 5 substance releases

Process: batch mix plants

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for batch mix plants
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Benzene 71-43-2 1.400E-04 kg/tonne
Formaldehyde 50-00-0 3.700E-04 kg/tonne
Toluene 108-88-3 5.000E-04 kg/tonne
Xylene 1330-20-7 1.350E-03 kg/tonne

Process: drum mix - natural gas-fired dryer with fabric filter

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix - Natural gas-fired dryer with fabric filter
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Benzene 71-43-2 1.950E-04 kg/tonne
Formaldehyde 50-00-0 1.550E-03 kg/tonne
Toluene 108-88-3 7.500E-05 kg/tonne
Xylene 1330-20-7 1.000E-04 kg/tonne
Ethylene 74-85-1 3.500E-03 kg/tonne
n-Hexane 110-54-3 4.600E-04 kg/tonne

Process: drum mix - no. 2 fuel oil-fired dryer - uncontrolled

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix - No. 2 fuel oil-fired dryer - Uncontrolled
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Benzene 71-43-2 1.950E-04 kg/tonne
Formaldehyde 50-00-0 1.550E-03 kg/tonne
Toluene 108-88-3 1.450E-03 kg/tonne
Xylene 1330-20-7 1.000E-04 kg/tonne
Ethylene 74-85-1 3.500E-03 kg/tonne
n-Hexane 110-54-3 4.600E-04 kg/tonne

Process: drum mix - waste/no.6 fuel oil-fired dryer fabric filter

Input: A = Total hot-mix asphalt produced (tonnes/year)

Emission factors for drum mix - Waste/No.6 fuel oil-fired dryer fabric filter
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Benzene 71-43-2 1.950E-04 kg/tonne
Formaldehyde 50-00-0 1.550E-03 kg/tonne
Toluene 108-88-3 1.450E-03 kg/tonne
Xylene 1330-20-7 1.000E-04 kg/tonne
Ethylene 74-85-1 3.500E-03 kg/tonne

Process: asphalt heater: natural gas boilers <10 MMBTU/hr

Input: A = amount of natural gas fuel used in the asphalt cement storage heater (m3/year)

Emission factors for asphalt heater: Natural gas boilers <10 MMBTU/hr
Substance name CAS RNFootnote 1  Emission factorFootnote 2  EF units
Benzene 71-43-2 3.364E-02 kg/10^6m^3
Formaldehyde 50-00-0 1.201E+00 kg/10^6m^3
Toluene 108-88-3 5.446E-02 kg/10^6m^3

Other emission sources: speciation profile for load-out and yard emissions

The emission factors are a function of asphalt volatility and mix temperature. They are calculated using this formula (where EFTOC represents 'emission factor for total organic carbon':

EFTOC  = 0.5*0.00172(-V)e((0.0251)(T+460)-20.43) (kg/tonne)

Inputs:

V = Asphalt volatility (USEPA default = -0.5)
T = HMA mix temperature (USEPA default = 325 F)
A = Total hot-mix asphalt produced (tonnes/year)

Other emission sources: Speciation profile for load-out and yard emissions
Substance name CAS RNFootnote 1 Weight %Footnote ** Emission factorFootnote 2 EF units
Ethylene 74-85-1 0.71 =EFTOC * Wt% /100    kg/tonne
Benzene 71-43-2 0.052 =EFTOC * Wt% /100   kg/tonne
Formaldehyde 50-00-0 0.088 =EFTOC * Wt% /100   kg/tonne
n-Hexane 110-54-3 0.15 =EFTOC * Wt% /100   kg/tonne
Styrene 100-42-5 0.0073 =EFTOC * Wt% /100   kg/tonne
Toluene 108-88-3 0.21 =EFTOC * Wt% /100   kg/tonne
Xylene 1330-20-7 0.49 =EFTOC * Wt% /100   kg/tonne

Other emission sources: speciation profile for silo filling and asphalt storage tank emissions

The emission factors are a function of asphalt volatility and mix temperature. They are calculated using this formula (where EFTOC represents 'emission factor for total organic carbon':

EF TOC  = 0.5*0.0504(-V)e((0.0251)(T+460)-20.43) (kg/tonne)

Inputs:

V = Asphalt volatility (USEPA default = -0.5)
T = HMA mix temperature (USEPA default = 325 F)
A = Total hot-mix asphalt produced (tonnes/year)

Other emission sources: Speciation profile for silo filling and asphalt storage tank emissions
Substance name CAS RNFootnote 1 Weight %Footnote ** Emission factorFootnote 2 EF units
Ethylene 74-85-1 1.1 =EFTOC * Wt% /100    kg/tonne
Benzene 71-43-2 0.032 =EFTOC * Wt% /100   kg/tonne
Formaldehyde 50-00-0 0.69 =EFTOC * Wt% /100   kg/tonne
n-Hexane 110-54-3 0.1 =EFTOC * Wt% /100   kg/tonne
Styrene 100-42-5 0.0054 =EFTOC * Wt% /100   kg/tonne
Toluene 108-88-3 0.062 =EFTOC * Wt% /100   kg/tonne
Xylene 1330-20-7 0.257 =EFTOC * Wt% /100   kg/tonne

Process: aggregate pile

See separate guidance for aggregate handling.

Process: asphalt storage tanks

See U.S. EPA TANKS document.

Emission Factor Sources:

Part 1,2,3,4,5 substances emissions factors from AP 42, Volume I, Fifth Edition, Chapter 11.1 - Hot Mix Asphalt Plants.

Part 1,2,3,4,5 substances emission factors from AP-42, Volume 1, Fifth Edition, Chapter 1.11 - Waste Oil Combustion.

Part 1,2,3,4,5 substances emission factors from AP-42, Volume 1, Fifth Edition, Chapter 1.4 - Natural Gas Combustion.

Vermont Used Oil Analysis and Waste Oil Furnace Emission Study, USEPA 1994.

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