Which Particulate Matter (PM) emission factor should I use?

The appropriate PM emission factor to use will vary depending on what information is available for your particular process. Our current guidance is as follows:

  • If no PM-10 emission factor is available, use the total particulate emission factors to calculate PM-10 emissions.
  • If no information regarding PM-2.5 is available, you are not required to calculate a separate PM2.5 emissions value.
  • If no information regarding condensable PM (PM-CON) is available, you are not required to calculate a PM-CON emissions value.

The following are examples of possible PM emissions calculation scenarios. If you need additional assistance with PM emission factors, please contact us.

Example 1

For an uncontrolled industrial boiler firing distillate oil, Table 1.3-6 in AP-42 lists the following PM-filterable emission factors:

  • PM-10: 1 pound per 1,000 gallons (gal) fuel
  • PM2.5: 0.25 pounds per 1,000 gal fuel

For an uncontrolled industrial boiler firing distillate oil, Table 1.3-2 in AP-42 lists the following PM-CON emission factor: 1.3 pounds per 1000 gal fuel.

In this case, the proper emission factors are:

  • PM10-PRI: 2.3 pounds per 1,000 gal fuel
  • PM10-FIL: 1 pounds per 1,000 gal fuel
  • PM2.5-PRI: 1.55 pounds per 1,000 gal fuel
  • PM2.5-FIL: 0.25 pounds per 1,000 gal fuel
  • PM-CON: 1.3 pounds per 1000 gal fuel

Example 2

For an uncontrolled natural gas fired boiler, Table 1.4-2 in AP-42 lists the following PM emission factors:

  • PM-CON: 5.7 pounds per 106 standard cubic feet (scf) fuel
  • PM-filterable: pounds per 106 scf fuel

A footnote states that all PM is assumed to be less than 1 micrometer in diameter, and, therefore, these factors can be used to calculate PM-10 or PM-2.5.

In this case, the proper emission factors are:

  • PM10-PRI: 7.6 pounds per 106 scf fuel
  • PM10-FIL: 1.9 pounds per 106 scf fuel
  • PM2.5-PRI: 7.6 pounds per 106 scf fuel
  • PM2.5-FIL: 1.9 pounds per 106 scf fuel
  • PM-CON: 5.7 pounds per 106 scf fuel

Example 3

For an uncontrolled preheated kiln in a cement manufacturing process, Table 11.6-2 in AP-42 lists a filterable total suspended particles (TSP) emission factor of 250 pounds per ton clinker produced. There is no information on PM-10 or PM-2.5 emissions or condensable particulate matter emissions. In this case, the filterable TSP emission factor would be used to calculate PM-10 and no PM-2.5 emissions would be calculated.

In this case, the proper emission factors are:

  • PM-10-PRI: 250 pounds per ton of clinker
  • PM-10-FIL: 250 pounds per ton of clinker

Show All Answers

1. Who must submit an emissions inventory report?
2. Who submits the emissions inventory report for a source that changed ownership?
3. Do I need to submit an emissions inventory if I did not operate in the previous calendar year?
4. Do I need to submit an emissions inventory if my facility shut down its operations in the previous calendar year?
5. What if some of the information pertaining to my facility is confidential?
6. If my facility doesn't operate all four quarters, why do the seasonal throughput percentages have to sum to 100%?
7. Why are the months listed for Seasonal Operating Percentages December to February, March to May, June to August, and September to November instead of the typical quarterly segments?
8. What should peaking plants enter for start time, hours/day, and days/week?
9. What pollutants must be reported?
10. Are there activities that are exempt from the emissions inventory?
11. Am I required to report fugitive emissions at my facility?
12. Do emissions from light duty vehicles such as security vehicles need to be included in the calculation of fugitive emissions from haul roads?
13. How do I report metals (or metalloids) hazardous air pollutants (HAP) such as chromium?
14. Which compounds are considered volatile organic compounds (VOC)?
15. What compounds are considered glycol ethers?
16. How should facilities report emissions due to malfunctions or upsets?
17. Which emission factor should I use if different factors are listed for volatile organic compounds (VOC), total organic compounds (TOC), and non-methane TOC?
18. Should stack height be measured from the ground or the top of the building?
19. Is there guidance on the acceptable accuracy of stack parameters?
20. What types of particulate matter must be reported?
21. Which Particulate Matter (PM) emission factor should I use?
22. Who pays emissions inventory fees for a source that changed ownership?
23. Is there a fee associated with my Class II Inventory?